20617640

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{11987}}^1$

素因数の和:12041

約数の個数: 32

約数和(自身を含む): 47472480

約数和(自身を除く): 26854840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 11987, 23974, 47948, 59935, 95896, 119870, 239740, 479480, 515441, 1030882, 2061764, 2577205, 4123528, 5154410, 10308820, 20617640]

約数ペア:

[(1, 20617640), (2, 10308820), (4, 5154410), (5, 4123528), (8, 2577205), (10, 2061764), (20, 1030882), (40, 515441), (43, 479480), (86, 239740), (172, 119870), (215, 95896), (344, 59935), (430, 47948), (860, 23974), (1720, 11987)]