21556717

素因数分解:

$7^2\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{787}}^1$

素因数の和:857

約数の個数: 24

約数和(自身を含む): 27668256

約数和(自身を除く): 6111539

約数列:

[1, 7, 13, 43, 49, 91, 301, 559, 637, 787, 2107, 3913, 5509, 10231, 27391, 33841, 38563, 71617, 236887, 439933, 501319, 1658209, 3079531, 21556717]

約数ペア:

[(1, 21556717), (7, 3079531), (13, 1658209), (43, 501319), (49, 439933), (91, 236887), (301, 71617), (559, 38563), (637, 33841), (787, 27391), (2107, 10231), (3913, 5509)]