21315780

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{79}}^1\times {\mathrm{1499}}^1$

素因数の和:1593

約数の個数: 72

約数和(自身を含む): 65520000

約数和(自身を除く): 44204220

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 30, 36, 45, 60, 79, 90, 158, 180, 237, 316, 395, 474, 711, 790, 948, 1185, 1422, 1499, 1580, 2370, 2844, 2998, 3555, 4497, 4740, 5996, 7110, 7495, 8994, 13491, 14220, 14990, 17988, 22485, 26982, 29980, 44970, 53964, 67455, 89940, 118421, 134910, 236842, 269820, 355263, 473684, 592105, 710526, 1065789, 1184210, 1421052, 1776315, 2131578, 2368420, 3552630, 4263156, 5328945, 7105260, 10657890, 21315780]

約数ペア:

[(1, 21315780), (2, 10657890), (3, 7105260), (4, 5328945), (5, 4263156), (6, 3552630), (9, 2368420), (10, 2131578), (12, 1776315), (15, 1421052), (18, 1184210), (20, 1065789), (30, 710526), (36, 592105), (45, 473684), (60, 355263), (79, 269820), (90, 236842), (158, 134910), (180, 118421), (237, 89940), (316, 67455), (395, 53964), (474, 44970), (711, 29980), (790, 26982), (948, 22485), (1185, 17988), (1422, 14990), (1499, 14220), (1580, 13491), (2370, 8994), (2844, 7495), (2998, 7110), (3555, 5996), (4497, 4740)]