21268405

素因数分解:

$5^1\times {\mathrm{71}}^1\times {\mathrm{181}}^1\times {\mathrm{331}}^1$

素因数の和:588

約数の個数: 16

約数和(自身を含む): 26103168

約数和(自身を除く): 4834763

約数列:

[1, 5, 71, 181, 331, 355, 905, 1655, 12851, 23501, 59911, 64255, 117505, 299555, 4253681, 21268405]

約数ペア:

[(1, 21268405), (5, 4253681), (71, 299555), (181, 117505), (331, 64255), (355, 59911), (905, 23501), (1655, 12851)]