21188990

素因数分解:

$2^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{111521}}^1$

素因数の和:111547

約数の個数: 16

約数和(自身を含む): 40147920

約数和(自身を除く): 18958930

約数列:

[1, 2, 5, 10, 19, 38, 95, 190, 111521, 223042, 557605, 1115210, 2118899, 4237798, 10594495, 21188990]

約数ペア:

[(1, 21188990), (2, 10594495), (5, 4237798), (10, 2118899), (19, 1115210), (38, 557605), (95, 223042), (190, 111521)]