640953

素因数分解:

$3^4\times {\mathrm{41}}^1\times {\mathrm{193}}^1$

素因数の和:246

約数の個数: 20

約数和(自身を含む): 985908

約数和(自身を除く): 344955

約数列:

[1, 3, 9, 27, 41, 81, 123, 193, 369, 579, 1107, 1737, 3321, 5211, 7913, 15633, 23739, 71217, 213651, 640953]

約数ペア:

[(1, 640953), (3, 213651), (9, 71217), (27, 23739), (41, 15633), (81, 7913), (123, 5211), (193, 3321), (369, 1737), (579, 1107)]