21780242

素因数分解:

$2^1\times {\mathrm{11}}^2\times {\mathrm{90001}}^1$

素因数の和:90025

約数の個数: 12

約数和(自身を含む): 35910798

約数和(自身を除く): 14130556

約数列:

[1, 2, 11, 22, 121, 242, 90001, 180002, 990011, 1980022, 10890121, 21780242]

約数ペア:

[(1, 21780242), (2, 10890121), (11, 1980022), (22, 990011), (121, 180002), (242, 90001)]