21805225

素因数分解:

$5^2\times {\mathrm{13}}^3\times {\mathrm{397}}^1$

素因数の和:446

約数の個数: 24

約数和(自身を含む): 29364440

約数和(自身を除く): 7559215

約数列:

[1, 5, 13, 25, 65, 169, 325, 397, 845, 1985, 2197, 4225, 5161, 9925, 10985, 25805, 54925, 67093, 129025, 335465, 872209, 1677325, 4361045, 21805225]

約数ペア:

[(1, 21805225), (5, 4361045), (13, 1677325), (25, 872209), (65, 335465), (169, 129025), (325, 67093), (397, 54925), (845, 25805), (1985, 10985), (2197, 9925), (4225, 5161)]