21987640

素因数分解:

$2^3\times 5^1\times {\mathrm{549691}}^1$

素因数の和:549702

約数の個数: 16

約数和(自身を含む): 49472280

約数和(自身を除く): 27484640

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 549691, 1099382, 2198764, 2748455, 4397528, 5496910, 10993820, 21987640]

約数ペア:

[(1, 21987640), (2, 10993820), (4, 5496910), (5, 4397528), (8, 2748455), (10, 2198764), (20, 1099382), (40, 549691)]