256802140

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{31}}^1\times {\mathrm{79}}^1\times {\mathrm{107}}^1$

素因数の和:240

約数の個数: 144

約数和(自身を含む): 661893120

約数和(自身を除く): 405090980

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 31, 35, 49, 62, 70, 79, 98, 107, 124, 140, 155, 158, 196, 214, 217, 245, 310, 316, 395, 428, 434, 490, 535, 553, 620, 749, 790, 868, 980, 1070, 1085, 1106, 1498, 1519, 1580, 2140, 2170, 2212, 2449, 2765, 2996, 3038, 3317, 3745, 3871, 4340, 4898, 5243, 5530, 6076, 6634, 7490, 7595, 7742, 8453, 9796, 10486, 11060, 12245, 13268, 14980, 15190, 15484, 16585, 16906, 17143, 19355, 20972, 23219, 24490, 26215, 30380, 33170, 33812, 34286, 38710, 42265, 46438, 48980, 52430, 59171, 66340, 68572, 77420, 84530, 85715, 92876, 104860, 116095, 118342, 120001, 162533, 169060, 171430, 232190, 236684, 240002, 262043, 295855, 325066, 342860, 414197, 464380, 480004, 524086, 591710, 600005, 650132, 812665, 828394, 1048172, 1183420, 1200010, 1310215, 1625330, 1656788, 1834301, 2070985, 2400020, 2620430, 3250660, 3668602, 4141970, 5240860, 7337204, 8283940, 9171505, 12840107, 18343010, 25680214, 36686020, 51360428, 64200535, 128401070, 256802140]

約数ペア:

[(1, 256802140), (2, 128401070), (4, 64200535), (5, 51360428), (7, 36686020), (10, 25680214), (14, 18343010), (20, 12840107), (28, 9171505), (31, 8283940), (35, 7337204), (49, 5240860), (62, 4141970), (70, 3668602), (79, 3250660), (98, 2620430), (107, 2400020), (124, 2070985), (140, 1834301), (155, 1656788), (158, 1625330), (196, 1310215), (214, 1200010), (217, 1183420), (245, 1048172), (310, 828394), (316, 812665), (395, 650132), (428, 600005), (434, 591710), (490, 524086), (535, 480004), (553, 464380), (620, 414197), (749, 342860), (790, 325066), (868, 295855), (980, 262043), (1070, 240002), (1085, 236684), (1106, 232190), (1498, 171430), (1519, 169060), (1580, 162533), (2140, 120001), (2170, 118342), (2212, 116095), (2449, 104860), (2765, 92876), (2996, 85715), (3038, 84530), (3317, 77420), (3745, 68572), (3871, 66340), (4340, 59171), (4898, 52430), (5243, 48980), (5530, 46438), (6076, 42265), (6634, 38710), (7490, 34286), (7595, 33812), (7742, 33170), (8453, 30380), (9796, 26215), (10486, 24490), (11060, 23219), (12245, 20972), (13268, 19355), (14980, 17143), (15190, 16906), (15484, 16585)]