81505640

素因数分解:

$2^3\times 5^1\times {\mathrm{43}}^1\times {\mathrm{47387}}^1$

素因数の和:47441

約数の個数: 32

約数和(自身を含む): 187656480

約数和(自身を除く): 106150840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720, 47387, 94774, 189548, 236935, 379096, 473870, 947740, 1895480, 2037641, 4075282, 8150564, 10188205, 16301128, 20376410, 40752820, 81505640]

約数ペア:

[(1, 81505640), (2, 40752820), (4, 20376410), (5, 16301128), (8, 10188205), (10, 8150564), (20, 4075282), (40, 2037641), (43, 1895480), (86, 947740), (172, 473870), (215, 379096), (344, 236935), (430, 189548), (860, 94774), (1720, 47387)]