81417620

素因数分解:

$2^2\times 5^1\times {\mathrm{491}}^1\times {\mathrm{8291}}^1$

素因数の和:8791

約数の個数: 24

約数和(自身を含む): 171345888

約数和(自身を除く): 89928268

約数列:

[1, 2, 4, 5, 10, 20, 491, 982, 1964, 2455, 4910, 8291, 9820, 16582, 33164, 41455, 82910, 165820, 4070881, 8141762, 16283524, 20354405, 40708810, 81417620]

約数ペア:

[(1, 81417620), (2, 40708810), (4, 20354405), (5, 16283524), (10, 8141762), (20, 4070881), (491, 165820), (982, 82910), (1964, 41455), (2455, 33164), (4910, 16582), (8291, 9820)]