81351280

素因数分解:

$2^4\times 5^1\times {\mathrm{1016891}}^1$

素因数の和:1016904

約数の個数: 20

約数和(自身を含む): 189141912

約数和(自身を除く): 107790632

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1016891, 2033782, 4067564, 5084455, 8135128, 10168910, 16270256, 20337820, 40675640, 81351280]

約数ペア:

[(1, 81351280), (2, 40675640), (4, 20337820), (5, 16270256), (8, 10168910), (10, 8135128), (16, 5084455), (20, 4067564), (40, 2033782), (80, 1016891)]