21380125

素因数分解:

$5^3\times {\mathrm{13}}^1\times {\mathrm{59}}^1\times {\mathrm{223}}^1$

素因数の和:310

約数の個数: 32

約数和(自身を含む): 29352960

約数和(自身を除く): 7972835

約数列:

[1, 5, 13, 25, 59, 65, 125, 223, 295, 325, 767, 1115, 1475, 1625, 2899, 3835, 5575, 7375, 13157, 14495, 19175, 27875, 65785, 72475, 95875, 171041, 328925, 362375, 855205, 1644625, 4276025, 21380125]

約数ペア:

[(1, 21380125), (5, 4276025), (13, 1644625), (25, 855205), (59, 362375), (65, 328925), (125, 171041), (223, 95875), (295, 72475), (325, 65785), (767, 27875), (1115, 19175), (1475, 14495), (1625, 13157), (2899, 7375), (3835, 5575)]