21407575

素因数分解:

$5^2\times 7^1\times {\mathrm{149}}^1\times {\mathrm{821}}^1$

素因数の和:987

約数の個数: 24

約数和(自身を含む): 30578400

約数和(自身を除く): 9170825

約数列:

[1, 5, 7, 25, 35, 149, 175, 745, 821, 1043, 3725, 4105, 5215, 5747, 20525, 26075, 28735, 122329, 143675, 611645, 856303, 3058225, 4281515, 21407575]

約数ペア:

[(1, 21407575), (5, 4281515), (7, 3058225), (25, 856303), (35, 611645), (149, 143675), (175, 122329), (745, 28735), (821, 26075), (1043, 20525), (3725, 5747), (4105, 5215)]