21305781

素因数分解:

$3^3\times 7^1\times {\mathrm{139}}^1\times {\mathrm{811}}^1$

素因数の和:966

約数の個数: 32

約数和(自身を含む): 36377600

約数和(自身を除く): 15071819

約数列:

[1, 3, 7, 9, 21, 27, 63, 139, 189, 417, 811, 973, 1251, 2433, 2919, 3753, 5677, 7299, 8757, 17031, 21897, 26271, 51093, 112729, 153279, 338187, 789103, 1014561, 2367309, 3043683, 7101927, 21305781]

約数ペア:

[(1, 21305781), (3, 7101927), (7, 3043683), (9, 2367309), (21, 1014561), (27, 789103), (63, 338187), (139, 153279), (189, 112729), (417, 51093), (811, 26271), (973, 21897), (1251, 17031), (2433, 8757), (2919, 7299), (3753, 5677)]