21505891

素因数分解:

${\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{2393}}^1$

素因数の和:2466

約数の個数: 16

約数和(自身を含む): 25280640

約数和(自身を除く): 3774749

約数列:

[1, 11, 19, 43, 209, 473, 817, 2393, 8987, 26323, 45467, 102899, 500137, 1131889, 1955081, 21505891]

約数ペア:

[(1, 21505891), (11, 1955081), (19, 1131889), (43, 500137), (209, 102899), (473, 45467), (817, 26323), (2393, 8987)]