16987887

素因数分解:

$3^6\times 7^1\times {\mathrm{3329}}^1$

素因数の和:3354

約数の個数: 28

約数和(自身を含む): 29117520

約数和(自身を除く): 12129633

約数列:

[1, 3, 7, 9, 21, 27, 63, 81, 189, 243, 567, 729, 1701, 3329, 5103, 9987, 23303, 29961, 69909, 89883, 209727, 269649, 629181, 808947, 1887543, 2426841, 5662629, 16987887]

約数ペア:

[(1, 16987887), (3, 5662629), (7, 2426841), (9, 1887543), (21, 808947), (27, 629181), (63, 269649), (81, 209727), (189, 89883), (243, 69909), (567, 29961), (729, 23303), (1701, 9987), (3329, 5103)]