19987700

素因数分解:

$2^2\times 5^2\times {\mathrm{199877}}^1$

素因数の和:199891

約数の個数: 18

約数和(自身を含む): 43373526

約数和(自身を除く): 23385826

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 199877, 399754, 799508, 999385, 1998770, 3997540, 4996925, 9993850, 19987700]

約数ペア:

[(1, 19987700), (2, 9993850), (4, 4996925), (5, 3997540), (10, 1998770), (20, 999385), (25, 799508), (50, 399754), (100, 199877)]