81280225

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{449}}^1\times {\mathrm{557}}^1$

素因数の和:1029

約数の個数: 24

約数和(自身を含む): 108977400

約数和(自身を除く): 27697175

約数列:

[1, 5, 13, 25, 65, 325, 449, 557, 2245, 2785, 5837, 7241, 11225, 13925, 29185, 36205, 145925, 181025, 250093, 1250465, 3251209, 6252325, 16256045, 81280225]

約数ペア:

[(1, 81280225), (5, 16256045), (13, 6252325), (25, 3251209), (65, 1250465), (325, 250093), (449, 181025), (557, 145925), (2245, 36205), (2785, 29185), (5837, 13925), (7241, 11225)]