21228740

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{81649}}^1$

素因数の和:81671

約数の個数: 24

約数和(自身を含む): 48010200

約数和(自身を除く): 26781460

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 81649, 163298, 326596, 408245, 816490, 1061437, 1632980, 2122874, 4245748, 5307185, 10614370, 21228740]

約数ペア:

[(1, 21228740), (2, 10614370), (4, 5307185), (5, 4245748), (10, 2122874), (13, 1632980), (20, 1061437), (26, 816490), (52, 408245), (65, 326596), (130, 163298), (260, 81649)]