20765775

素因数分解:

$3^1\times 5^2\times {\mathrm{43}}^1\times {\mathrm{47}}^1\times {\mathrm{137}}^1$

素因数の和:240

約数の個数: 48

約数和(自身を含む): 36140544

約数和(自身を除く): 15374769

約数列:

[1, 3, 5, 15, 25, 43, 47, 75, 129, 137, 141, 215, 235, 411, 645, 685, 705, 1075, 1175, 2021, 2055, 3225, 3425, 3525, 5891, 6063, 6439, 10105, 10275, 17673, 19317, 29455, 30315, 32195, 50525, 88365, 96585, 147275, 151575, 160975, 276877, 441825, 482925, 830631, 1384385, 4153155, 6921925, 20765775]

約数ペア:

[(1, 20765775), (3, 6921925), (5, 4153155), (15, 1384385), (25, 830631), (43, 482925), (47, 441825), (75, 276877), (129, 160975), (137, 151575), (141, 147275), (215, 96585), (235, 88365), (411, 50525), (645, 32195), (685, 30315), (705, 29455), (1075, 19317), (1175, 17673), (2021, 10275), (2055, 10105), (3225, 6439), (3425, 6063), (3525, 5891)]