21242975

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{163}}^1\times {\mathrm{401}}^1$

素因数の和:587

約数の個数: 24

約数和(自身を含む): 28612752

約数和(自身を除く): 7369777

約数列:

[1, 5, 13, 25, 65, 163, 325, 401, 815, 2005, 2119, 4075, 5213, 10025, 10595, 26065, 52975, 65363, 130325, 326815, 849719, 1634075, 4248595, 21242975]

約数ペア:

[(1, 21242975), (5, 4248595), (13, 1634075), (25, 849719), (65, 326815), (163, 130325), (325, 65363), (401, 52975), (815, 26065), (2005, 10595), (2119, 10025), (4075, 5213)]