21780689

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{103}}^1\times {\mathrm{1777}}^1$

素因数の和:1904

約数の個数: 16

約数和(自身を含む): 26627328

約数和(自身を除く): 4846639

約数列:

[1, 7, 17, 103, 119, 721, 1751, 1777, 12257, 12439, 30209, 183031, 211463, 1281217, 3111527, 21780689]

約数ペア:

[(1, 21780689), (7, 3111527), (17, 1281217), (103, 211463), (119, 183031), (721, 30209), (1751, 12439), (1777, 12257)]