21121479

素因数分解:

$3^4\times {\mathrm{107}}^1\times {\mathrm{2437}}^1$

素因数の和:2556

約数の個数: 20

約数和(自身を含む): 31859784

約数和(自身を除く): 10738305

約数列:

[1, 3, 9, 27, 81, 107, 321, 963, 2437, 2889, 7311, 8667, 21933, 65799, 197397, 260759, 782277, 2346831, 7040493, 21121479]

約数ペア:

[(1, 21121479), (3, 7040493), (9, 2346831), (27, 782277), (81, 260759), (107, 197397), (321, 65799), (963, 21933), (2437, 8667), (2889, 7311)]