21315125

素因数分解:

$5^3\times {\mathrm{13}}^2\times {\mathrm{1009}}^1$

素因数の和:1050

約数の個数: 24

約数和(自身を含む): 28833480

約数和(自身を除く): 7518355

約数列:

[1, 5, 13, 25, 65, 125, 169, 325, 845, 1009, 1625, 4225, 5045, 13117, 21125, 25225, 65585, 126125, 170521, 327925, 852605, 1639625, 4263025, 21315125]

約数ペア:

[(1, 21315125), (5, 4263025), (13, 1639625), (25, 852605), (65, 327925), (125, 170521), (169, 126125), (325, 65585), (845, 25225), (1009, 21125), (1625, 13117), (4225, 5045)]