21280925

素因数分解:

$5^2\times {\mathrm{29}}^1\times {\mathrm{149}}^1\times {\mathrm{197}}^1$

素因数の和:385

約数の個数: 24

約数和(自身を含む): 27621000

約数和(自身を除く): 6340075

約数列:

[1, 5, 25, 29, 145, 149, 197, 725, 745, 985, 3725, 4321, 4925, 5713, 21605, 28565, 29353, 108025, 142825, 146765, 733825, 851237, 4256185, 21280925]

約数ペア:

[(1, 21280925), (5, 4256185), (25, 851237), (29, 733825), (145, 146765), (149, 142825), (197, 108025), (725, 29353), (745, 28565), (985, 21605), (3725, 5713), (4321, 4925)]