257800

素因数分解:

$2^3\times 5^2\times {\mathrm{1289}}^1$

素因数の和:1305

約数の個数: 24

約数和(自身を含む): 599850

約数和(自身を除く): 342050

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 1289, 2578, 5156, 6445, 10312, 12890, 25780, 32225, 51560, 64450, 128900, 257800]

約数ペア:

[(1, 257800), (2, 128900), (4, 64450), (5, 51560), (8, 32225), (10, 25780), (20, 12890), (25, 10312), (40, 6445), (50, 5156), (100, 2578), (200, 1289)]