21491281

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{59}}^1\times {\mathrm{3061}}^1$

素因数の和:3144

約数の個数: 16

約数和(自身を含む): 26455680

約数和(自身を除く): 4964399

約数列:

[1, 7, 17, 59, 119, 413, 1003, 3061, 7021, 21427, 52037, 180599, 364259, 1264193, 3070183, 21491281]

約数ペア:

[(1, 21491281), (7, 3070183), (17, 1264193), (59, 364259), (119, 180599), (413, 52037), (1003, 21427), (3061, 7021)]