21318957

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{337}}^1$

素因数の和:431

約数の個数: 40

約数和(自身を含む): 35335872

約数和(自身を除く): 14016915

約数列:

[1, 3, 9, 11, 27, 33, 71, 81, 99, 213, 297, 337, 639, 781, 891, 1011, 1917, 2343, 3033, 3707, 5751, 7029, 9099, 11121, 21087, 23927, 27297, 33363, 63261, 71781, 100089, 215343, 263197, 300267, 646029, 789591, 1938087, 2368773, 7106319, 21318957]

約数ペア:

[(1, 21318957), (3, 7106319), (9, 2368773), (11, 1938087), (27, 789591), (33, 646029), (71, 300267), (81, 263197), (99, 215343), (213, 100089), (297, 71781), (337, 63261), (639, 33363), (781, 27297), (891, 23927), (1011, 21087), (1917, 11121), (2343, 9099), (3033, 7029), (3707, 5751)]