21090691780

素因数分解:

$2^2\times 5^1\times {\mathrm{1054534589}}^1$

素因数の和:1054534598

約数の個数: 12

約数和(自身を含む): 44290452780

約数和(自身を除く): 23199761000

約数列:

[1, 2, 4, 5, 10, 20, 1054534589, 2109069178, 4218138356, 5272672945, 10545345890, 21090691780]

約数ペア:

[(1, 21090691780), (2, 10545345890), (4, 5272672945), (5, 4218138356), (10, 2109069178), (20, 1054534589)]