128577640

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{78401}}^1$

素因数の和:78453

約数の個数: 32

約数和(自身を含む): 296359560

約数和(自身を除く): 167781920

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820, 1640, 78401, 156802, 313604, 392005, 627208, 784010, 1568020, 3136040, 3214441, 6428882, 12857764, 16072205, 25715528, 32144410, 64288820, 128577640]

約数ペア:

[(1, 128577640), (2, 64288820), (4, 32144410), (5, 25715528), (8, 16072205), (10, 12857764), (20, 6428882), (40, 3214441), (41, 3136040), (82, 1568020), (164, 784010), (205, 627208), (328, 392005), (410, 313604), (820, 156802), (1640, 78401)]