21004291

素因数分解:

$7^3\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{293}}^1$

素因数の和:344

約数の個数: 32

約数和(自身を含む): 28224000

約数和(自身を除く): 7219709

約数列:

[1, 7, 11, 19, 49, 77, 133, 209, 293, 343, 539, 931, 1463, 2051, 3223, 3773, 5567, 6517, 10241, 14357, 22561, 38969, 61237, 71687, 100499, 157927, 272783, 428659, 1105489, 1909481, 3000613, 21004291]

約数ペア:

[(1, 21004291), (7, 3000613), (11, 1909481), (19, 1105489), (49, 428659), (77, 272783), (133, 157927), (209, 100499), (293, 71687), (343, 61237), (539, 38969), (931, 22561), (1463, 14357), (2051, 10241), (3223, 6517), (3773, 5567)]