21800

素因数分解:

$2^3\times 5^2\times {\mathrm{109}}^1$

素因数の和:125

約数の個数: 24

約数和(自身を含む): 51150

約数和(自身を除く): 29350

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 109, 200, 218, 436, 545, 872, 1090, 2180, 2725, 4360, 5450, 10900, 21800]

約数ペア:

[(1, 21800), (2, 10900), (4, 5450), (5, 4360), (8, 2725), (10, 2180), (20, 1090), (25, 872), (40, 545), (50, 436), (100, 218), (109, 200)]