20987950

素因数分解:

$2^1\times 5^2\times {\mathrm{109}}^1\times {\mathrm{3851}}^1$

素因数の和:3972

約数の個数: 24

約数和(自身を含む): 39405960

約数和(自身を除く): 18418010

約数列:

[1, 2, 5, 10, 25, 50, 109, 218, 545, 1090, 2725, 3851, 5450, 7702, 19255, 38510, 96275, 192550, 419759, 839518, 2098795, 4197590, 10493975, 20987950]

約数ペア:

[(1, 20987950), (2, 10493975), (5, 4197590), (10, 2098795), (25, 839518), (50, 419759), (109, 192550), (218, 96275), (545, 38510), (1090, 19255), (2725, 7702), (3851, 5450)]