21457820

素因数分解:

$2^2\times 5^1\times {\mathrm{859}}^1\times {\mathrm{1249}}^1$

素因数の和:2117

約数の個数: 24

約数和(自身を含む): 45150000

約数和(自身を除く): 23692180

約数列:

[1, 2, 4, 5, 10, 20, 859, 1249, 1718, 2498, 3436, 4295, 4996, 6245, 8590, 12490, 17180, 24980, 1072891, 2145782, 4291564, 5364455, 10728910, 21457820]

約数ペア:

[(1, 21457820), (2, 10728910), (4, 5364455), (5, 4291564), (10, 2145782), (20, 1072891), (859, 24980), (1249, 17180), (1718, 12490), (2498, 8590), (3436, 6245), (4295, 4996)]