20905155

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{9109}}^1$

素因数の和:9140

約数の個数: 32

約数和(自身を含む): 39355200

約数和(自身を除く): 18450045

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 85, 135, 153, 255, 459, 765, 2295, 9109, 27327, 45545, 81981, 136635, 154853, 245943, 409905, 464559, 774265, 1229715, 1393677, 2322795, 4181031, 6968385, 20905155]

約数ペア:

[(1, 20905155), (3, 6968385), (5, 4181031), (9, 2322795), (15, 1393677), (17, 1229715), (27, 774265), (45, 464559), (51, 409905), (85, 245943), (135, 154853), (153, 136635), (255, 81981), (459, 45545), (765, 27327), (2295, 9109)]