21218575

素因数分解:

$5^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{37}}^1\times {\mathrm{113}}^1$

素因数の和:196

約数の個数: 48

約数和(自身を含む): 32230080

約数和(自身を除く): 11011505

約数列:

[1, 5, 7, 25, 29, 35, 37, 113, 145, 175, 185, 203, 259, 565, 725, 791, 925, 1015, 1073, 1295, 2825, 3277, 3955, 4181, 5075, 5365, 6475, 7511, 16385, 19775, 20905, 22939, 26825, 29267, 37555, 81925, 104525, 114695, 121249, 146335, 187775, 573475, 606245, 731675, 848743, 3031225, 4243715, 21218575]

約数ペア:

[(1, 21218575), (5, 4243715), (7, 3031225), (25, 848743), (29, 731675), (35, 606245), (37, 573475), (113, 187775), (145, 146335), (175, 121249), (185, 114695), (203, 104525), (259, 81925), (565, 37555), (725, 29267), (791, 26825), (925, 22939), (1015, 20905), (1073, 19775), (1295, 16385), (2825, 7511), (3277, 6475), (3955, 5365), (4181, 5075)]