21891364

素因数分解:

$2^2\times {\mathrm{11}}^1\times {\mathrm{389}}^1\times {\mathrm{1279}}^1$

素因数の和:1683

約数の個数: 24

約数和(自身を含む): 41932800

約数和(自身を除く): 20041436

約数列:

[1, 2, 4, 11, 22, 44, 389, 778, 1279, 1556, 2558, 4279, 5116, 8558, 14069, 17116, 28138, 56276, 497531, 995062, 1990124, 5472841, 10945682, 21891364]

約数ペア:

[(1, 21891364), (2, 10945682), (4, 5472841), (11, 1990124), (22, 995062), (44, 497531), (389, 56276), (778, 28138), (1279, 17116), (1556, 14069), (2558, 8558), (4279, 5116)]