19981900

素因数分解:

$2^2\times 5^2\times {\mathrm{199819}}^1$

素因数の和:199833

約数の個数: 18

約数和(自身を含む): 43360940

約数和(自身を除く): 23379040

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 199819, 399638, 799276, 999095, 1998190, 3996380, 4995475, 9990950, 19981900]

約数ペア:

[(1, 19981900), (2, 9990950), (4, 4995475), (5, 3996380), (10, 1998190), (20, 999095), (25, 799276), (50, 399638), (100, 199819)]