19915100

素因数分解:

$2^2\times 5^2\times {\mathrm{199151}}^1$

素因数の和:199165

約数の個数: 18

約数和(自身を含む): 43215984

約数和(自身を除く): 23300884

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 199151, 398302, 796604, 995755, 1991510, 3983020, 4978775, 9957550, 19915100]

約数ペア:

[(1, 19915100), (2, 9957550), (4, 4978775), (5, 3983020), (10, 1991510), (20, 995755), (25, 796604), (50, 398302), (100, 199151)]