18720555

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{131}}^1\times {\mathrm{1361}}^1$

素因数の和:1507

約数の個数: 32

約数和(自身を含む): 34518528

約数和(自身を除く): 15797973

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 131, 393, 655, 917, 1361, 1965, 2751, 4083, 4585, 6805, 9527, 13755, 20415, 28581, 47635, 142905, 178291, 534873, 891455, 1248037, 2674365, 3744111, 6240185, 18720555]

約数ペア:

[(1, 18720555), (3, 6240185), (5, 3744111), (7, 2674365), (15, 1248037), (21, 891455), (35, 534873), (105, 178291), (131, 142905), (393, 47635), (655, 28581), (917, 20415), (1361, 13755), (1965, 9527), (2751, 6805), (4083, 4585)]