20217785

素因数分解:

$5^1\times 7^1\times {\mathrm{29}}^1\times {\mathrm{19919}}^1$

素因数の和:19960

約数の個数: 16

約数和(自身を含む): 28684800

約数和(自身を除く): 8467015

約数列:

[1, 5, 7, 29, 35, 145, 203, 1015, 19919, 99595, 139433, 577651, 697165, 2888255, 4043557, 20217785]

約数ペア:

[(1, 20217785), (5, 4043557), (7, 2888255), (29, 697165), (35, 577651), (145, 139433), (203, 99595), (1015, 19919)]