18865820

素因数分解:

$2^2\times 5^1\times {\mathrm{43}}^1\times {\mathrm{21937}}^1$

素因数の和:21989

約数の個数: 24

約数和(自身を含む): 40541424

約数和(自身を除く): 21675604

約数列:

[1, 2, 4, 5, 10, 20, 43, 86, 172, 215, 430, 860, 21937, 43874, 87748, 109685, 219370, 438740, 943291, 1886582, 3773164, 4716455, 9432910, 18865820]

約数ペア:

[(1, 18865820), (2, 9432910), (4, 4716455), (5, 3773164), (10, 1886582), (20, 943291), (43, 438740), (86, 219370), (172, 109685), (215, 87748), (430, 43874), (860, 21937)]