21318680

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{107}}^1\times {\mathrm{293}}^1$

素因数の和:428

約数の個数: 64

約数和(自身を含む): 51438240

約数和(自身を除く): 30119560

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 107, 136, 170, 214, 293, 340, 428, 535, 586, 680, 856, 1070, 1172, 1465, 1819, 2140, 2344, 2930, 3638, 4280, 4981, 5860, 7276, 9095, 9962, 11720, 14552, 18190, 19924, 24905, 31351, 36380, 39848, 49810, 62702, 72760, 99620, 125404, 156755, 199240, 250808, 313510, 532967, 627020, 1065934, 1254040, 2131868, 2664835, 4263736, 5329670, 10659340, 21318680]

約数ペア:

[(1, 21318680), (2, 10659340), (4, 5329670), (5, 4263736), (8, 2664835), (10, 2131868), (17, 1254040), (20, 1065934), (34, 627020), (40, 532967), (68, 313510), (85, 250808), (107, 199240), (136, 156755), (170, 125404), (214, 99620), (293, 72760), (340, 62702), (428, 49810), (535, 39848), (586, 36380), (680, 31351), (856, 24905), (1070, 19924), (1172, 18190), (1465, 14552), (1819, 11720), (2140, 9962), (2344, 9095), (2930, 7276), (3638, 5860), (4280, 4981)]