21517875

素因数分解:

$3^2\times 5^3\times {\mathrm{31}}^1\times {\mathrm{617}}^1$

素因数の和:669

約数の個数: 48

約数和(自身を含む): 40105728

約数和(自身を除く): 18587853

約数列:

[1, 3, 5, 9, 15, 25, 31, 45, 75, 93, 125, 155, 225, 279, 375, 465, 617, 775, 1125, 1395, 1851, 2325, 3085, 3875, 5553, 6975, 9255, 11625, 15425, 19127, 27765, 34875, 46275, 57381, 77125, 95635, 138825, 172143, 231375, 286905, 478175, 694125, 860715, 1434525, 2390875, 4303575, 7172625, 21517875]

約数ペア:

[(1, 21517875), (3, 7172625), (5, 4303575), (9, 2390875), (15, 1434525), (25, 860715), (31, 694125), (45, 478175), (75, 286905), (93, 231375), (125, 172143), (155, 138825), (225, 95635), (279, 77125), (375, 57381), (465, 46275), (617, 34875), (775, 27765), (1125, 19127), (1395, 15425), (1851, 11625), (2325, 9255), (3085, 6975), (3875, 5553)]