20687720

素因数分解:

$2^3\times 5^1\times {\mathrm{311}}^1\times {\mathrm{1663}}^1$

素因数の和:1985

約数の個数: 32

約数和(自身を含む): 46725120

約数和(自身を除く): 26037400

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 311, 622, 1244, 1555, 1663, 2488, 3110, 3326, 6220, 6652, 8315, 12440, 13304, 16630, 33260, 66520, 517193, 1034386, 2068772, 2585965, 4137544, 5171930, 10343860, 20687720]

約数ペア:

[(1, 20687720), (2, 10343860), (4, 5171930), (5, 4137544), (8, 2585965), (10, 2068772), (20, 1034386), (40, 517193), (311, 66520), (622, 33260), (1244, 16630), (1555, 13304), (1663, 12440), (2488, 8315), (3110, 6652), (3326, 6220)]