21788990

素因数分解:

$2^1\times 5^1\times {\mathrm{79}}^1\times {\mathrm{27581}}^1$

素因数の和:27667

約数の個数: 16

約数和(自身を含む): 39718080

約数和(自身を除く): 17929090

約数列:

[1, 2, 5, 10, 79, 158, 395, 790, 27581, 55162, 137905, 275810, 2178899, 4357798, 10894495, 21788990]

約数ペア:

[(1, 21788990), (2, 10894495), (5, 4357798), (10, 2178899), (79, 275810), (158, 137905), (395, 55162), (790, 27581)]