21481525

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{421}}^1$

素因数の和:601

約数の個数: 24

約数和(自身を含む): 28937384

約数和(自身を除く): 7455859

約数列:

[1, 5, 13, 25, 65, 157, 325, 421, 785, 2041, 2105, 3925, 5473, 10205, 10525, 27365, 51025, 66097, 136825, 330485, 859261, 1652425, 4296305, 21481525]

約数ペア:

[(1, 21481525), (5, 4296305), (13, 1652425), (25, 859261), (65, 330485), (157, 136825), (325, 66097), (421, 51025), (785, 27365), (2041, 10525), (2105, 10205), (3925, 5473)]