About the Number
195071481000
2進数表記:10110101101011001010101001010010101000
漢数字表記:千九百五十億七千百四十八万千
素因数分解:
素因数の和:364
約数の個数: 1152
約数和(自身を含む): 789136901280
約数和(自身を除く): 594065420280
約数列:
[1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 15, 17, 18, 20, 22, 24, 25, 30, 33, 34, 36, 40, 41, 44, 45, 50, 51, 55, 60, 66, 68, 72, 75, 82, 85, 88, 90, 99, 100, 102, 110, 120, 121, 123, 125, 132, 136, 150, 153, 164, 165, 170, 180, 187, 198, 200, 204, 205, 220, 225, 242, 246, 250, 255, 257, 264, 275, 300, 306, 328, 330, 340, 360, 363, 369, 374, 375, 396, 408, 410, 425, 440, 450, 451, 484, 492, 495, 500, 510, 514, 550, 561, 600, 605, 612, 615, 660, 680, 697, 726, 738, 748, 750, 765, 771, 792, 820, 825, 850, 900, 902, 935, 968, 984, 990, 1000, 1020, 1025, 1028, 1089, 1100, 1122, 1125, 1210, 1224, 1230, 1275, 1285, 1320, 1353, 1375, 1394, 1452, 1476, 1496, 1500, 1530, 1542, 1640, 1650, 1683, 1700, 1800, 1804, 1815, 1845, 1870, 1980, 2040, 2050, 2056, 2057, 2091, 2125, 2178, 2200, 2244, 2250, 2255, 2313, 2420, 2460, 2475, 2550, 2570, 2706, 2750, 2788, 2805, 2827, 2904, 2952, 3000, 3025, 3060, 3075, 3084, 3300, 3366, 3400, 3485, 3608, 3630, 3690, 3740, 3825, 3855, 3960, 4059, 4100, 4114, 4125, 4182, 4250, 4356, 4369, 4488, 4500, 4510, 4626, 4675, 4840, 4920, 4950, 4961, 5100, 5125, 5140, 5412, 5445, 5500, 5576, 5610, 5654, 6050, 6120, 6150, 6168, 6171, 6273, 6375, 6425, 6600, 6732, 6765, 6970, 7260, 7380, 7480, 7650, 7667, 7710, 8118, 8200, 8228, 8250, 8364, 8415, 8481, 8500, 8712, 8738, 9000, 9020, 9075, 9225, 9252, 9350, 9900, 9922, 10200, 10250, 10280, 10285, 10455, 10537, 10824, 10890, 11000, 11220, 11275, 11308, 11565, 12100, 12300, 12342, 12375, 12546, 12750, 12850, 13107, 13464, 13530, 13940, 14025, 14135, 14520, 14760, 14883, 15125, 15300, 15334, 15375, 15420, 16236, 16456, 16500, 16728, 16830, 16962, 17000, 17425, 17476, 18040, 18150, 18450, 18504, 18513, 18700, 19125, 19275, 19800, 19844, 20295, 20500, 20570, 20910, 21074, 21780, 21845, 22440, 22550, 22616, 23001, 23130, 23375, 24200, 24600, 24684, 24750, 24805, 25092, 25443, 25500, 25700, 26214, 27060, 27225, 27880, 28050, 28270, 29766, 30250, 30600, 30668, 30750, 30840, 30855, 31097, 31365, 31611, 32125, 32472, 33000, 33660, 33825, 33924, 34850, 34952, 36300, 36900, 37026, 37400, 38250, 38335, 38550, 39321, 39688, 40590, 41000, 41140, 41820, 42075, 42148, 42405, 43560, 43690, 44649, 45100, 45375, 46002, 46125, 46260, 46750, 48059, 49368, 49500, 49610, 50184, 50886, 51000, 51400, 51425, 52275, 52428, 52685, 54120, 54450, 56100, 56375, 56540, 57825, 59532, 60500, 61336, 61500, 61710, 62194, 62730, 63222, 64250, 65535, 67320, 67650, 67848, 69003, 69700, 70125, 70675, 72600, 73800, 74052, 74415, 76500, 76670, 77100, 78642, 81180, 82280, 83640, 84150, 84296, 84337, 84810, 87125, 87380, 89298, 90200, 90750, 92004, 92250, 92520, 92565, 93291, 93500, 94833, 96118, 96375, 99000, 99220, 101475, 101772, 102850, 104550, 104856, 105370, 108900, 109225, 112200, 112750, 113080, 115005, 115650, 115907, 119064, 121000, 123000, 123420, 124025, 124388, 125460, 126444, 127215, 128500, 131070, 135300, 136125, 138006, 139400, 140250, 141350, 144177, 148104, 148830, 153000, 153340, 154200, 154275, 155485, 156825, 157284, 158055, 162360, 168300, 168674, 169125, 169620, 174250, 174760, 178596, 179129, 181500, 184008, 184500, 185130, 186582, 187000, 189666, 191675, 192236, 192750, 196605, 198440, 202950, 203544, 205700, 209100, 210375, 210740, 212025, 217800, 218450, 223245, 225500, 230010, 231300, 231814, 240295, 246840, 248050, 248776, 250920, 252888, 253011, 254430, 257000, 257125, 261375, 262140, 263425, 270600, 272250, 276012, 279873, 280500, 282700, 288354, 289125, 297660, 306680, 308550, 310970, 313650, 314568, 316110, 327675, 336600, 337348, 338250, 339240, 345015, 347721, 348500, 353375, 357192, 358258, 363000, 369000, 370260, 372075, 373164, 379332, 383350, 384472, 385500, 393210, 405900, 411400, 418200, 420750, 421480, 421685, 424050, 432531, 436900, 446490, 451000, 460020, 462600, 462825, 463628, 466455, 474165, 480590, 496100, 506022, 507375, 508860, 514250, 522750, 524280, 526850, 528649, 537387, 544500, 546125, 552024, 559746, 561000, 565400, 575025, 576708, 578250, 579535, 595320, 617100, 620125, 621940, 627300, 632220, 636075, 655350, 674696, 676500, 690030, 695442, 697000, 706750, 716516, 720885, 740520, 744150, 746328, 758664, 759033, 766700, 771000, 771375, 777425, 784125, 786420, 790275, 811800, 841500, 843370, 848100, 865062, 873800, 892980, 895645, 920040, 925650, 927256, 932910, 948330, 958375, 961180, 983025, 992200, 1012044, 1014750, 1017720, 1028500, 1043163, 1045500, 1053700, 1057298, 1060125, 1074774, 1089000, 1092250, 1116225, 1119492, 1150050, 1153416, 1156500, 1159070, 1201475, 1234200, 1240250, 1243880, 1254600, 1264440, 1265055, 1272150, 1274977, 1310700, 1317125, 1353000, 1380060, 1390884, 1399365, 1413500, 1433032, 1441770, 1488300, 1518066, 1533400, 1542750, 1554850, 1568250, 1572840, 1580550, 1585947, 1612161, 1638375, 1683000, 1686740, 1696200, 1725075, 1730124, 1738605, 1785960, 1791290, 1851300, 1860375, 1865820, 1896660, 1916750, 1922360, 1966050, 1970419, 2024088, 2029500, 2057000, 2086326, 2091000, 2107400, 2108425, 2114596, 2120250, 2149548, 2162655, 2184500, 2232450, 2238984, 2300100, 2313000, 2314125, 2318140, 2332275, 2370825, 2402950, 2480500, 2530110, 2544300, 2549954, 2621400, 2634250, 2643245, 2686935, 2760120, 2781768, 2798730, 2827000, 2875125, 2883540, 2897675, 2976600, 3036132, 3085500, 3109700, 3136500, 3161100, 3171894, 3180375, 3224322, 3276750, 3373480, 3450150, 3460248, 3477210, 3582580, 3604425, 3702600, 3720750, 3731640, 3793320, 3795165, 3824931, 3833500, 3887125, 3932100, 3940838, 3951375, 4059000, 4172652, 4216850, 4229192, 4240500, 4299096, 4325310, 4369000, 4464900, 4478225, 4600200, 4628250, 4636280, 4664550, 4741650, 4757841, 4805900, 4915125, 4961000, 5060220, 5088600, 5099908, 5215815, 5268500, 5286490, 5373870, 5581125, 5597460, 5750250, 5767080, 5795350, 5911257, 6007375, 6072264, 6171000, 6219400, 6273000, 6322200, 6325275, 6343788, 6360750, 6374885, 6448644, 6553500, 6900300, 6954420, 6996825, 7165160, 7208850, 7441500, 7590330, 7649862, 7667000, 7774250, 7864200, 7881676, 7902750, 7929735, 8060805, 8345304, 8433700, 8481000, 8625375, 8650620, 8693025, 8929800, 8956450, 9256500, 9329100, 9483300, 9515682, 9611800, 9830250, 9852095, 10120440, 10199816, 10431630, 10537000, 10542125, 10572980, 10747740, 10813275, 11162250, 11194920, 11474793, 11500500, 11590700, 11661375, 11822514, 11854125, 12014750, 12650550, 12687576, 12721500, 12749770, 12897288, 13107000, 13216225, 13434675, 13800600, 13908840, 13993650, 14417700, 14488375, 14883000, 15180660, 15299724, 15548500, 15763352, 15805500, 15859470, 16121610, 16867400, 17250750, 17301240, 17386050, 17733771, 17912900, 18022125, 18513000, 18658200, 18966600, 18975825, 19031364, 19124655, 19660500, 19704190, 20863260, 21084250, 21145960, 21495480, 21626550, 21674609, 22324500, 22391125, 22949586, 23001000, 23181400, 23322750, 23645028, 23708250, 23789205, 24029500, 25301100, 25443000, 25499540, 26079075, 26432450, 26869350, 27987300, 28835400, 28976750, 29556285, 30361320, 30599448, 31097000, 31611000, 31626375, 31718940, 31874425, 32243220, 34501500, 34772100, 34984125, 35467542, 35825800, 36044250, 37951650, 38062728, 38249310, 39321000, 39408380, 39648675, 40304025, 41726520, 42168500, 43253100, 43349218, 43465125, 44649000, 44782250, 45899172, 46645500, 47290056, 47416500, 47578410, 48059000, 49260475, 50602200, 50999080, 52158150, 52864900, 53738700, 54066375, 55974600, 57373965, 57953500, 59112570, 63252750, 63437880, 63748850, 64486440, 65023827, 66081125, 67173375, 69003000, 69544200, 69968250, 70935084, 72088500, 75903300, 76498620, 78816760, 79297350, 80608050, 84337000, 86506200, 86698436, 86930250, 88668855, 89564500, 91798344, 93291000, 94833000, 94879125, 95156820, 95623275, 98520950, 104316300, 105729800, 107477400, 108132750, 108373045, 114747930, 115907000, 118225140, 118946025, 126505500, 127497700, 130047654, 130395375, 132162250, 134346750, 139936500, 141870168, 144177000, 147781425, 151806600, 152997240, 158594700, 159372125, 161216100, 173396872, 173860500, 177337710, 179129000, 189758250, 190313640, 191246550, 195071481, 197041900, 198243375, 201520125, 208632600, 216265500, 216746090, 229495860, 236450280, 237892050, 246302375, 253011000, 254995400, 260095308, 260790750, 264324500, 268693500, 279873000, 286869825, 295562850, 317189400, 318744250, 322432200, 325119135, 347721000, 354675420, 379516500, 382493100, 390142962, 394083800, 396486750, 403040250, 432531000, 433492180, 443344275, 458991720, 475784100, 478116375, 492604750, 520190616, 521581500, 528649000, 537387000, 541865225, 573739650, 591125700, 594730125, 637488500, 650238270, 709350840, 738907125, 759033000, 764986200, 780285924, 792973500, 806080500, 866984360, 886688550, 951568200, 956232750, 975357405, 985209500, 1043163000, 1083730450, 1147479300, 1182251400, 1189460250, 1274977000, 1300476540, 1434349125, 1477814250, 1560571848, 1585947000, 1612161000, 1625595675, 1773377100, 1912465500, 1950714810, 1970419000, 2167460900, 2216721375, 2294958600, 2378920500, 2600953080, 2709326125, 2868698250, 2955628500, 3251191350, 3546754200, 3824931000, 3901429620, 4334921800, 4433442750, 4757841000, 4876787025, 5418652250, 5737396500, 5911257000, 6502382700, 7802859240, 8127978375, 8866885500, 9753574050, 10837304500, 11474793000, 13004765400, 16255956750, 17733771000, 19507148100, 21674609000, 24383935125, 32511913500, 39014296200, 48767870250, 65023827000, 97535740500, 195071481000]
約数ペア:
[(1, 195071481000), (2, 97535740500), (3, 65023827000), (4, 48767870250), (5, 39014296200), (6, 32511913500), (8, 24383935125), (9, 21674609000), (10, 19507148100), (11, 17733771000), (12, 16255956750), (15, 13004765400), (17, 11474793000), (18, 10837304500), (20, 9753574050), (22, 8866885500), (24, 8127978375), (25, 7802859240), (30, 6502382700), (33, 5911257000), (34, 5737396500), (36, 5418652250), (40, 4876787025), (41, 4757841000), (44, 4433442750), (45, 4334921800), (50, 3901429620), (51, 3824931000), (55, 3546754200), (60, 3251191350), (66, 2955628500), (68, 2868698250), (72, 2709326125), (75, 2600953080), (82, 2378920500), (85, 2294958600), (88, 2216721375), (90, 2167460900), (99, 1970419000), (100, 1950714810), (102, 1912465500), (110, 1773377100), (120, 1625595675), (121, 1612161000), (123, 1585947000), (125, 1560571848), (132, 1477814250), (136, 1434349125), (150, 1300476540), (153, 1274977000), (164, 1189460250), (165, 1182251400), (170, 1147479300), (180, 1083730450), (187, 1043163000), (198, 985209500), (200, 975357405), (204, 956232750), (205, 951568200), (220, 886688550), (225, 866984360), (242, 806080500), (246, 792973500), (250, 780285924), (255, 764986200), (257, 759033000), (264, 738907125), (275, 709350840), (300, 650238270), (306, 637488500), (328, 594730125), (330, 591125700), (340, 573739650), (360, 541865225), (363, 537387000), (369, 528649000), (374, 521581500), (375, 520190616), (396, 492604750), (408, 478116375), (410, 475784100), (425, 458991720), (440, 443344275), (450, 433492180), (451, 432531000), (484, 403040250), (492, 396486750), (495, 394083800), (500, 390142962), (510, 382493100), (514, 379516500), (550, 354675420), (561, 347721000), (600, 325119135), (605, 322432200), (612, 318744250), (615, 317189400), (660, 295562850), (680, 286869825), (697, 279873000), (726, 268693500), (738, 264324500), (748, 260790750), (750, 260095308), (765, 254995400), (771, 253011000), (792, 246302375), (820, 237892050), (825, 236450280), (850, 229495860), (900, 216746090), (902, 216265500), (935, 208632600), (968, 201520125), (984, 198243375), (990, 197041900), (1000, 195071481), (1020, 191246550), (1025, 190313640), (1028, 189758250), (1089, 179129000), (1100, 177337710), (1122, 173860500), (1125, 173396872), (1210, 161216100), (1224, 159372125), (1230, 158594700), (1275, 152997240), (1285, 151806600), (1320, 147781425), (1353, 144177000), (1375, 141870168), (1394, 139936500), (1452, 134346750), (1476, 132162250), (1496, 130395375), (1500, 130047654), (1530, 127497700), (1542, 126505500), (1640, 118946025), (1650, 118225140), (1683, 115907000), (1700, 114747930), (1800, 108373045), (1804, 108132750), (1815, 107477400), (1845, 105729800), (1870, 104316300), (1980, 98520950), (2040, 95623275), (2050, 95156820), (2056, 94879125), (2057, 94833000), (2091, 93291000), (2125, 91798344), (2178, 89564500), (2200, 88668855), (2244, 86930250), (2250, 86698436), (2255, 86506200), (2313, 84337000), (2420, 80608050), (2460, 79297350), (2475, 78816760), (2550, 76498620), (2570, 75903300), (2706, 72088500), (2750, 70935084), (2788, 69968250), (2805, 69544200), (2827, 69003000), (2904, 67173375), (2952, 66081125), (3000, 65023827), (3025, 64486440), (3060, 63748850), (3075, 63437880), (3084, 63252750), (3300, 59112570), (3366, 57953500), (3400, 57373965), (3485, 55974600), (3608, 54066375), (3630, 53738700), (3690, 52864900), (3740, 52158150), (3825, 50999080), (3855, 50602200), (3960, 49260475), (4059, 48059000), (4100, 47578410), (4114, 47416500), (4125, 47290056), (4182, 46645500), (4250, 45899172), (4356, 44782250), (4369, 44649000), (4488, 43465125), (4500, 43349218), (4510, 43253100), (4626, 42168500), (4675, 41726520), (4840, 40304025), (4920, 39648675), (4950, 39408380), (4961, 39321000), (5100, 38249310), (5125, 38062728), (5140, 37951650), (5412, 36044250), (5445, 35825800), (5500, 35467542), (5576, 34984125), (5610, 34772100), (5654, 34501500), (6050, 32243220), (6120, 31874425), (6150, 31718940), (6168, 31626375), (6171, 31611000), (6273, 31097000), (6375, 30599448), (6425, 30361320), (6600, 29556285), (6732, 28976750), (6765, 28835400), (6970, 27987300), (7260, 26869350), (7380, 26432450), (7480, 26079075), (7650, 25499540), (7667, 25443000), (7710, 25301100), (8118, 24029500), (8200, 23789205), (8228, 23708250), (8250, 23645028), (8364, 23322750), (8415, 23181400), (8481, 23001000), (8500, 22949586), (8712, 22391125), (8738, 22324500), (9000, 21674609), (9020, 21626550), (9075, 21495480), (9225, 21145960), (9252, 21084250), (9350, 20863260), (9900, 19704190), (9922, 19660500), (10200, 19124655), (10250, 19031364), (10280, 18975825), (10285, 18966600), (10455, 18658200), (10537, 18513000), (10824, 18022125), (10890, 17912900), (11000, 17733771), (11220, 17386050), (11275, 17301240), (11308, 17250750), (11565, 16867400), (12100, 16121610), (12300, 15859470), (12342, 15805500), (12375, 15763352), (12546, 15548500), (12750, 15299724), (12850, 15180660), (13107, 14883000), (13464, 14488375), (13530, 14417700), (13940, 13993650), (14025, 13908840), (14135, 13800600), (14520, 13434675), (14760, 13216225), (14883, 13107000), (15125, 12897288), (15300, 12749770), (15334, 12721500), (15375, 12687576), (15420, 12650550), (16236, 12014750), (16456, 11854125), (16500, 11822514), (16728, 11661375), (16830, 11590700), (16962, 11500500), (17000, 11474793), (17425, 11194920), (17476, 11162250), (18040, 10813275), (18150, 10747740), (18450, 10572980), (18504, 10542125), (18513, 10537000), (18700, 10431630), (19125, 10199816), (19275, 10120440), (19800, 9852095), (19844, 9830250), (20295, 9611800), (20500, 9515682), (20570, 9483300), (20910, 9329100), (21074, 9256500), (21780, 8956450), (21845, 8929800), (22440, 8693025), (22550, 8650620), (22616, 8625375), (23001, 8481000), (23130, 8433700), (23375, 8345304), (24200, 8060805), (24600, 7929735), (24684, 7902750), (24750, 7881676), (24805, 7864200), (25092, 7774250), (25443, 7667000), (25500, 7649862), (25700, 7590330), (26214, 7441500), (27060, 7208850), (27225, 7165160), (27880, 6996825), (28050, 6954420), (28270, 6900300), (29766, 6553500), (30250, 6448644), (30600, 6374885), (30668, 6360750), (30750, 6343788), (30840, 6325275), (30855, 6322200), (31097, 6273000), (31365, 6219400), (31611, 6171000), (32125, 6072264), (32472, 6007375), (33000, 5911257), (33660, 5795350), (33825, 5767080), (33924, 5750250), (34850, 5597460), (34952, 5581125), (36300, 5373870), (36900, 5286490), (37026, 5268500), (37400, 5215815), (38250, 5099908), (38335, 5088600), (38550, 5060220), (39321, 4961000), (39688, 4915125), (40590, 4805900), (41000, 4757841), (41140, 4741650), (41820, 4664550), (42075, 4636280), (42148, 4628250), (42405, 4600200), (43560, 4478225), (43690, 4464900), (44649, 4369000), (45100, 4325310), (45375, 4299096), (46002, 4240500), (46125, 4229192), (46260, 4216850), (46750, 4172652), (48059, 4059000), (49368, 3951375), (49500, 3940838), (49610, 3932100), (50184, 3887125), (50886, 3833500), (51000, 3824931), (51400, 3795165), (51425, 3793320), (52275, 3731640), (52428, 3720750), (52685, 3702600), (54120, 3604425), (54450, 3582580), (56100, 3477210), (56375, 3460248), (56540, 3450150), (57825, 3373480), (59532, 3276750), (60500, 3224322), (61336, 3180375), (61500, 3171894), (61710, 3161100), (62194, 3136500), (62730, 3109700), (63222, 3085500), (64250, 3036132), (65535, 2976600), (67320, 2897675), (67650, 2883540), (67848, 2875125), (69003, 2827000), (69700, 2798730), (70125, 2781768), (70675, 2760120), (72600, 2686935), (73800, 2643245), (74052, 2634250), (74415, 2621400), (76500, 2549954), (76670, 2544300), (77100, 2530110), (78642, 2480500), (81180, 2402950), (82280, 2370825), (83640, 2332275), (84150, 2318140), (84296, 2314125), (84337, 2313000), (84810, 2300100), (87125, 2238984), (87380, 2232450), (89298, 2184500), (90200, 2162655), (90750, 2149548), (92004, 2120250), (92250, 2114596), (92520, 2108425), (92565, 2107400), (93291, 2091000), (93500, 2086326), (94833, 2057000), (96118, 2029500), (96375, 2024088), (99000, 1970419), (99220, 1966050), (101475, 1922360), (101772, 1916750), (102850, 1896660), (104550, 1865820), (104856, 1860375), (105370, 1851300), (108900, 1791290), (109225, 1785960), (112200, 1738605), (112750, 1730124), (113080, 1725075), (115005, 1696200), (115650, 1686740), (115907, 1683000), (119064, 1638375), (121000, 1612161), (123000, 1585947), (123420, 1580550), (124025, 1572840), (124388, 1568250), (125460, 1554850), (126444, 1542750), (127215, 1533400), (128500, 1518066), (131070, 1488300), (135300, 1441770), (136125, 1433032), (138006, 1413500), (139400, 1399365), (140250, 1390884), (141350, 1380060), (144177, 1353000), (148104, 1317125), (148830, 1310700), (153000, 1274977), (153340, 1272150), (154200, 1265055), (154275, 1264440), (155485, 1254600), (156825, 1243880), (157284, 1240250), (158055, 1234200), (162360, 1201475), (168300, 1159070), (168674, 1156500), (169125, 1153416), (169620, 1150050), (174250, 1119492), (174760, 1116225), (178596, 1092250), (179129, 1089000), (181500, 1074774), (184008, 1060125), (184500, 1057298), (185130, 1053700), (186582, 1045500), (187000, 1043163), (189666, 1028500), (191675, 1017720), (192236, 1014750), (192750, 1012044), (196605, 992200), (198440, 983025), (202950, 961180), (203544, 958375), (205700, 948330), (209100, 932910), (210375, 927256), (210740, 925650), (212025, 920040), (217800, 895645), (218450, 892980), (223245, 873800), (225500, 865062), (230010, 848100), (231300, 843370), (231814, 841500), (240295, 811800), (246840, 790275), (248050, 786420), (248776, 784125), (250920, 777425), (252888, 771375), (253011, 771000), (254430, 766700), (257000, 759033), (257125, 758664), (261375, 746328), (262140, 744150), (263425, 740520), (270600, 720885), (272250, 716516), (276012, 706750), (279873, 697000), (280500, 695442), (282700, 690030), (288354, 676500), (289125, 674696), (297660, 655350), (306680, 636075), (308550, 632220), (310970, 627300), (313650, 621940), (314568, 620125), (316110, 617100), (327675, 595320), (336600, 579535), (337348, 578250), (338250, 576708), (339240, 575025), (345015, 565400), (347721, 561000), (348500, 559746), (353375, 552024), (357192, 546125), (358258, 544500), (363000, 537387), (369000, 528649), (370260, 526850), (372075, 524280), (373164, 522750), (379332, 514250), (383350, 508860), (384472, 507375), (385500, 506022), (393210, 496100), (405900, 480590), (411400, 474165), (418200, 466455), (420750, 463628), (421480, 462825), (421685, 462600), (424050, 460020), (432531, 451000), (436900, 446490)]このpageの処理時間: 1.223876714706421 seconds