19988975

素因数分解:

$5^2\times {\mathrm{29}}^1\times {\mathrm{79}}^1\times {\mathrm{349}}^1$

素因数の和:467

約数の個数: 24

約数和(自身を含む): 26040000

約数和(自身を除く): 6051025

約数列:

[1, 5, 25, 29, 79, 145, 349, 395, 725, 1745, 1975, 2291, 8725, 10121, 11455, 27571, 50605, 57275, 137855, 253025, 689275, 799559, 3997795, 19988975]

約数ペア:

[(1, 19988975), (5, 3997795), (25, 799559), (29, 689275), (79, 253025), (145, 137855), (349, 57275), (395, 50605), (725, 27571), (1745, 11455), (1975, 10121), (2291, 8725)]