19999980

素因数分解:

$2^2\times 3^3\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1$

素因数の和:86

約数の個数: 384

約数和(自身を含む): 85800960

約数和(自身を除く): 65800980

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 18, 20, 21, 22, 26, 27, 28, 30, 33, 35, 36, 37, 39, 42, 44, 45, 52, 54, 55, 60, 63, 65, 66, 70, 74, 77, 78, 84, 90, 91, 99, 105, 108, 110, 111, 117, 126, 130, 132, 135, 140, 143, 148, 154, 156, 165, 180, 182, 185, 189, 195, 198, 210, 220, 222, 231, 234, 252, 259, 260, 270, 273, 286, 297, 308, 315, 330, 333, 351, 364, 370, 378, 385, 390, 396, 407, 420, 429, 444, 455, 462, 468, 481, 495, 518, 540, 546, 555, 572, 585, 594, 630, 660, 666, 693, 702, 715, 740, 756, 770, 777, 780, 814, 819, 858, 910, 924, 945, 962, 990, 999, 1001, 1036, 1092, 1110, 1155, 1170, 1188, 1221, 1260, 1287, 1295, 1332, 1365, 1386, 1404, 1430, 1443, 1485, 1540, 1554, 1628, 1638, 1665, 1716, 1755, 1820, 1890, 1924, 1980, 1998, 2002, 2035, 2079, 2145, 2220, 2310, 2331, 2340, 2405, 2442, 2457, 2574, 2590, 2730, 2772, 2849, 2860, 2886, 2970, 3003, 3108, 3276, 3330, 3367, 3465, 3510, 3663, 3780, 3861, 3885, 3996, 4004, 4070, 4095, 4158, 4290, 4329, 4620, 4662, 4810, 4884, 4914, 4995, 5005, 5148, 5180, 5291, 5460, 5698, 5772, 5940, 6006, 6105, 6435, 6660, 6734, 6930, 6993, 7020, 7215, 7326, 7722, 7770, 8140, 8190, 8316, 8547, 8580, 8658, 9009, 9324, 9620, 9828, 9990, 10010, 10101, 10395, 10582, 10989, 11396, 11655, 12012, 12210, 12285, 12870, 12987, 13468, 13860, 13986, 14245, 14430, 14652, 15015, 15444, 15540, 15873, 16380, 16835, 17094, 17316, 18018, 18315, 19305, 19980, 20020, 20202, 20790, 21164, 21645, 21978, 23310, 24420, 24570, 25641, 25740, 25974, 26455, 27027, 27972, 28490, 28860, 30030, 30303, 31746, 33670, 34188, 34965, 36036, 36630, 37037, 38610, 40404, 41580, 42735, 43290, 43956, 45045, 46620, 47619, 49140, 50505, 51282, 51948, 52910, 54054, 54945, 56980, 60060, 60606, 63492, 64935, 67340, 69930, 73260, 74074, 76923, 77220, 79365, 85470, 86580, 90090, 90909, 95238, 101010, 102564, 105820, 108108, 109890, 111111, 121212, 128205, 129870, 135135, 139860, 142857, 148148, 151515, 153846, 158730, 170940, 180180, 181818, 185185, 190476, 202020, 219780, 222222, 238095, 256410, 259740, 270270, 285714, 303030, 307692, 317460, 333333, 363636, 370370, 384615, 444444, 454545, 476190, 512820, 540540, 555555, 571428, 606060, 666666, 714285, 740740, 769230, 909090, 952380, 999999, 1111110, 1333332, 1428570, 1538460, 1666665, 1818180, 1999998, 2222220, 2857140, 3333330, 3999996, 4999995, 6666660, 9999990, 19999980]

約数ペア:

[(1, 19999980), (2, 9999990), (3, 6666660), (4, 4999995), (5, 3999996), (6, 3333330), (7, 2857140), (9, 2222220), (10, 1999998), (11, 1818180), (12, 1666665), (13, 1538460), (14, 1428570), (15, 1333332), (18, 1111110), (20, 999999), (21, 952380), (22, 909090), (26, 769230), (27, 740740), (28, 714285), (30, 666666), (33, 606060), (35, 571428), (36, 555555), (37, 540540), (39, 512820), (42, 476190), (44, 454545), (45, 444444), (52, 384615), (54, 370370), (55, 363636), (60, 333333), (63, 317460), (65, 307692), (66, 303030), (70, 285714), (74, 270270), (77, 259740), (78, 256410), (84, 238095), (90, 222222), (91, 219780), (99, 202020), (105, 190476), (108, 185185), (110, 181818), (111, 180180), (117, 170940), (126, 158730), (130, 153846), (132, 151515), (135, 148148), (140, 142857), (143, 139860), (148, 135135), (154, 129870), (156, 128205), (165, 121212), (180, 111111), (182, 109890), (185, 108108), (189, 105820), (195, 102564), (198, 101010), (210, 95238), (220, 90909), (222, 90090), (231, 86580), (234, 85470), (252, 79365), (259, 77220), (260, 76923), (270, 74074), (273, 73260), (286, 69930), (297, 67340), (308, 64935), (315, 63492), (330, 60606), (333, 60060), (351, 56980), (364, 54945), (370, 54054), (378, 52910), (385, 51948), (390, 51282), (396, 50505), (407, 49140), (420, 47619), (429, 46620), (444, 45045), (455, 43956), (462, 43290), (468, 42735), (481, 41580), (495, 40404), (518, 38610), (540, 37037), (546, 36630), (555, 36036), (572, 34965), (585, 34188), (594, 33670), (630, 31746), (660, 30303), (666, 30030), (693, 28860), (702, 28490), (715, 27972), (740, 27027), (756, 26455), (770, 25974), (777, 25740), (780, 25641), (814, 24570), (819, 24420), (858, 23310), (910, 21978), (924, 21645), (945, 21164), (962, 20790), (990, 20202), (999, 20020), (1001, 19980), (1036, 19305), (1092, 18315), (1110, 18018), (1155, 17316), (1170, 17094), (1188, 16835), (1221, 16380), (1260, 15873), (1287, 15540), (1295, 15444), (1332, 15015), (1365, 14652), (1386, 14430), (1404, 14245), (1430, 13986), (1443, 13860), (1485, 13468), (1540, 12987), (1554, 12870), (1628, 12285), (1638, 12210), (1665, 12012), (1716, 11655), (1755, 11396), (1820, 10989), (1890, 10582), (1924, 10395), (1980, 10101), (1998, 10010), (2002, 9990), (2035, 9828), (2079, 9620), (2145, 9324), (2220, 9009), (2310, 8658), (2331, 8580), (2340, 8547), (2405, 8316), (2442, 8190), (2457, 8140), (2574, 7770), (2590, 7722), (2730, 7326), (2772, 7215), (2849, 7020), (2860, 6993), (2886, 6930), (2970, 6734), (3003, 6660), (3108, 6435), (3276, 6105), (3330, 6006), (3367, 5940), (3465, 5772), (3510, 5698), (3663, 5460), (3780, 5291), (3861, 5180), (3885, 5148), (3996, 5005), (4004, 4995), (4070, 4914), (4095, 4884), (4158, 4810), (4290, 4662), (4329, 4620)]