20578760

素因数分解:

$2^3\times 5^1\times {\mathrm{499}}^1\times {\mathrm{1031}}^1$

素因数の和:1541

約数の個数: 32

約数和(自身を含む): 46440000

約数和(自身を除く): 25861240

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 499, 998, 1031, 1996, 2062, 2495, 3992, 4124, 4990, 5155, 8248, 9980, 10310, 19960, 20620, 41240, 514469, 1028938, 2057876, 2572345, 4115752, 5144690, 10289380, 20578760]

約数ペア:

[(1, 20578760), (2, 10289380), (4, 5144690), (5, 4115752), (8, 2572345), (10, 2057876), (20, 1028938), (40, 514469), (499, 41240), (998, 20620), (1031, 19960), (1996, 10310), (2062, 9980), (2495, 8248), (3992, 5155), (4124, 4990)]