19902020

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{7159}}^1$

素因数の和:7307

約数の個数: 24

約数和(自身を含む): 42100800

約数和(自身を除く): 22198780

約数列:

[1, 2, 4, 5, 10, 20, 139, 278, 556, 695, 1390, 2780, 7159, 14318, 28636, 35795, 71590, 143180, 995101, 1990202, 3980404, 4975505, 9951010, 19902020]

約数ペア:

[(1, 19902020), (2, 9951010), (4, 4975505), (5, 3980404), (10, 1990202), (20, 995101), (139, 143180), (278, 71590), (556, 35795), (695, 28636), (1390, 14318), (2780, 7159)]