21107781

素因数分解:

$3^2\times {\mathrm{59}}^1\times {\mathrm{127}}^1\times {\mathrm{313}}^1$

素因数の和:505

約数の個数: 24

約数和(自身を含む): 31349760

約数和(自身を除く): 10241979

約数列:

[1, 3, 9, 59, 127, 177, 313, 381, 531, 939, 1143, 2817, 7493, 18467, 22479, 39751, 55401, 67437, 119253, 166203, 357759, 2345309, 7035927, 21107781]

約数ペア:

[(1, 21107781), (3, 7035927), (9, 2345309), (59, 357759), (127, 166203), (177, 119253), (313, 67437), (381, 55401), (531, 39751), (939, 22479), (1143, 18467), (2817, 7493)]