20640825

素因数分解:

$3^4\times 5^2\times {\mathrm{10193}}^1$

素因数の和:10215

約数の個数: 30

約数和(自身を含む): 38237694

約数和(自身を除く): 17596869

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 75, 81, 135, 225, 405, 675, 2025, 10193, 30579, 50965, 91737, 152895, 254825, 275211, 458685, 764475, 825633, 1376055, 2293425, 4128165, 6880275, 20640825]

約数ペア:

[(1, 20640825), (3, 6880275), (5, 4128165), (9, 2293425), (15, 1376055), (25, 825633), (27, 764475), (45, 458685), (75, 275211), (81, 254825), (135, 152895), (225, 91737), (405, 50965), (675, 30579), (2025, 10193)]