21163025

素因数分解:

$5^2\times {\mathrm{13}}^2\times {\mathrm{5009}}^1$

素因数の和:5045

約数の個数: 18

約数和(自身を含む): 28421730

約数和(自身を除く): 7258705

約数列:

[1, 5, 13, 25, 65, 169, 325, 845, 4225, 5009, 25045, 65117, 125225, 325585, 846521, 1627925, 4232605, 21163025]

約数ペア:

[(1, 21163025), (5, 4232605), (13, 1627925), (25, 846521), (65, 325585), (169, 125225), (325, 65117), (845, 25045), (4225, 5009)]