21157820

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{36479}}^1$

素因数の和:36517

約数の個数: 24

約数和(自身を含む): 45964800

約数和(自身を除く): 24806980

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 145, 290, 580, 36479, 72958, 145916, 182395, 364790, 729580, 1057891, 2115782, 4231564, 5289455, 10578910, 21157820]

約数ペア:

[(1, 21157820), (2, 10578910), (4, 5289455), (5, 4231564), (10, 2115782), (20, 1057891), (29, 729580), (58, 364790), (116, 182395), (145, 145916), (290, 72958), (580, 36479)]