20885540

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{80329}}^1$

素因数の和:80351

約数の個数: 24

約数和(自身を含む): 47234040

約数和(自身を除く): 26348500

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 80329, 160658, 321316, 401645, 803290, 1044277, 1606580, 2088554, 4177108, 5221385, 10442770, 20885540]

約数ペア:

[(1, 20885540), (2, 10442770), (4, 5221385), (5, 4177108), (10, 2088554), (13, 1606580), (20, 1044277), (26, 803290), (52, 401645), (65, 321316), (130, 160658), (260, 80329)]