20721519

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{25301}}^1$

素因数の和:25327

約数の個数: 24

約数和(自身を含む): 36839712

約数和(自身を除く): 16118193

約数列:

[1, 3, 7, 9, 13, 21, 39, 63, 91, 117, 273, 819, 25301, 75903, 177107, 227709, 328913, 531321, 986739, 1593963, 2302391, 2960217, 6907173, 20721519]

約数ペア:

[(1, 20721519), (3, 6907173), (7, 2960217), (9, 2302391), (13, 1593963), (21, 986739), (39, 531321), (63, 328913), (91, 227709), (117, 177107), (273, 75903), (819, 25301)]