20561765

素因数分解:

$5^1\times 7^1\times {\mathrm{311}}^1\times {\mathrm{1889}}^1$

素因数の和:2212

約数の個数: 16

約数和(自身を含む): 28304640

約数和(自身を除く): 7742875

約数列:

[1, 5, 7, 35, 311, 1555, 1889, 2177, 9445, 10885, 13223, 66115, 587479, 2937395, 4112353, 20561765]

約数ペア:

[(1, 20561765), (5, 4112353), (7, 2937395), (35, 587479), (311, 66115), (1555, 13223), (1889, 10885), (2177, 9445)]