21072069

素因数分解:

$3^4\times {\mathrm{157}}^1\times {\mathrm{1657}}^1$

素因数の和:1826

約数の個数: 20

約数和(自身を含む): 31697644

約数和(自身を除く): 10625575

約数列:

[1, 3, 9, 27, 81, 157, 471, 1413, 1657, 4239, 4971, 12717, 14913, 44739, 134217, 260149, 780447, 2341341, 7024023, 21072069]

約数ペア:

[(1, 21072069), (3, 7024023), (9, 2341341), (27, 780447), (81, 260149), (157, 134217), (471, 44739), (1413, 14913), (1657, 12717), (4239, 4971)]