21720891

素因数分解:

$3^1\times {\mathrm{43}}^1\times {\mathrm{163}}^1\times {\mathrm{1033}}^1$

素因数の和:1242

約数の個数: 16

約数和(自身を含む): 29845376

約数和(自身を除く): 8124485

約数列:

[1, 3, 43, 129, 163, 489, 1033, 3099, 7009, 21027, 44419, 133257, 168379, 505137, 7240297, 21720891]

約数ペア:

[(1, 21720891), (3, 7240297), (43, 505137), (129, 168379), (163, 133257), (489, 44419), (1033, 21027), (3099, 7009)]