21235640

素因数分解:

$2^3\times 5^1\times {\mathrm{163}}^1\times {\mathrm{3257}}^1$

素因数の和:3431

約数の個数: 32

約数和(自身を含む): 48088080

約数和(自身を除く): 26852440

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 163, 326, 652, 815, 1304, 1630, 3257, 3260, 6514, 6520, 13028, 16285, 26056, 32570, 65140, 130280, 530891, 1061782, 2123564, 2654455, 4247128, 5308910, 10617820, 21235640]

約数ペア:

[(1, 21235640), (2, 10617820), (4, 5308910), (5, 4247128), (8, 2654455), (10, 2123564), (20, 1061782), (40, 530891), (163, 130280), (326, 65140), (652, 32570), (815, 26056), (1304, 16285), (1630, 13028), (3257, 6520), (3260, 6514)]