21149390

素因数分解:

$2^1\times 5^1\times {\mathrm{409}}^1\times {\mathrm{5171}}^1$

素因数の和:5587

約数の個数: 16

約数和(自身を含む): 38169360

約数和(自身を除く): 17019970

約数列:

[1, 2, 5, 10, 409, 818, 2045, 4090, 5171, 10342, 25855, 51710, 2114939, 4229878, 10574695, 21149390]

約数ペア:

[(1, 21149390), (2, 10574695), (5, 4229878), (10, 2114939), (409, 51710), (818, 25855), (2045, 10342), (4090, 5171)]