21042217

素因数分解:

$7^2\times {\mathrm{23}}^1\times {\mathrm{18671}}^1$

素因数の和:18708

約数の個数: 12

約数和(自身を含む): 25543296

約数和(自身を除く): 4501079

約数列:

[1, 7, 23, 49, 161, 1127, 18671, 130697, 429433, 914879, 3006031, 21042217]

約数ペア:

[(1, 21042217), (7, 3006031), (23, 914879), (49, 429433), (161, 130697), (1127, 18671)]