21145220

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{14891}}^1$

素因数の和:14971

約数の個数: 24

約数和(自身を含む): 45033408

約数和(自身を除く): 23888188

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420, 14891, 29782, 59564, 74455, 148910, 297820, 1057261, 2114522, 4229044, 5286305, 10572610, 21145220]

約数ペア:

[(1, 21145220), (2, 10572610), (4, 5286305), (5, 4229044), (10, 2114522), (20, 1057261), (71, 297820), (142, 148910), (284, 74455), (355, 59564), (710, 29782), (1420, 14891)]