21189620

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{25841}}^1$

素因数の和:25891

約数の個数: 24

約数和(自身を含む): 45585288

約数和(自身を除く): 24395668

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 25841, 51682, 103364, 129205, 258410, 516820, 1059481, 2118962, 4237924, 5297405, 10594810, 21189620]

約数ペア:

[(1, 21189620), (2, 10594810), (4, 5297405), (5, 4237924), (10, 2118962), (20, 1059481), (41, 516820), (82, 258410), (164, 129205), (205, 103364), (410, 51682), (820, 25841)]