21513877

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{271}}^1\times {\mathrm{1031}}^1$

素因数の和:1320

約数の個数: 16

約数和(自身を含む): 26947584

約数和(自身を除く): 5433707

約数列:

[1, 7, 11, 77, 271, 1031, 1897, 2981, 7217, 11341, 20867, 79387, 279401, 1955807, 3073411, 21513877]

約数ペア:

[(1, 21513877), (7, 3073411), (11, 1955807), (77, 279401), (271, 79387), (1031, 20867), (1897, 11341), (2981, 7217)]