15721225

素因数分解:

$5^2\times {\mathrm{13}}^2\times {\mathrm{61}}^2$

素因数の和:158

約数の個数: 27

約数和(自身を含む): 21460959

約数和(自身を除く): 5739734

約数列:

[1, 5, 13, 25, 61, 65, 169, 305, 325, 793, 845, 1525, 3721, 3965, 4225, 10309, 18605, 19825, 48373, 51545, 93025, 241865, 257725, 628849, 1209325, 3144245, 15721225]

約数ペア:

[(1, 15721225), (5, 3144245), (13, 1209325), (25, 628849), (61, 257725), (65, 241865), (169, 93025), (305, 51545), (325, 48373), (793, 19825), (845, 18605), (1525, 10309), (3721, 4225)]