20445985

素因数分解:

$5^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{4909}}^1$

素因数の和:4945

約数の個数: 24

約数和(自身を含む): 30225960

約数和(自身を除く): 9779975

約数列:

[1, 5, 7, 17, 35, 49, 85, 119, 245, 595, 833, 4165, 4909, 24545, 34363, 83453, 171815, 240541, 417265, 584171, 1202705, 2920855, 4089197, 20445985]

約数ペア:

[(1, 20445985), (5, 4089197), (7, 2920855), (17, 1202705), (35, 584171), (49, 417265), (85, 240541), (119, 171815), (245, 83453), (595, 34363), (833, 24545), (4165, 4909)]