81991100

素因数分解:

$2^2\times 5^2\times {\mathrm{819911}}^1$

素因数の和:819925

約数の個数: 18

約数和(自身を含む): 177920904

約数和(自身を除く): 95929804

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 819911, 1639822, 3279644, 4099555, 8199110, 16398220, 20497775, 40995550, 81991100]

約数ペア:

[(1, 81991100), (2, 40995550), (4, 20497775), (5, 16398220), (10, 8199110), (20, 4099555), (25, 3279644), (50, 1639822), (100, 819911)]