21221764

素因数分解:

$2^2\times {\mathrm{41}}^1\times {\mathrm{129401}}^1$

素因数の和:129446

約数の個数: 12

約数和(自身を含む): 38044188

約数和(自身を除く): 16822424

約数列:

[1, 2, 4, 41, 82, 164, 129401, 258802, 517604, 5305441, 10610882, 21221764]

約数ペア:

[(1, 21221764), (2, 10610882), (4, 5305441), (41, 517604), (82, 258802), (164, 129401)]