19981400

素因数分解:

$2^3\times 5^2\times {\mathrm{99907}}^1$

素因数の和:99923

約数の個数: 24

約数和(自身を含む): 46457220

約数和(自身を除く): 26475820

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 99907, 199814, 399628, 499535, 799256, 999070, 1998140, 2497675, 3996280, 4995350, 9990700, 19981400]

約数ペア:

[(1, 19981400), (2, 9990700), (4, 4995350), (5, 3996280), (8, 2497675), (10, 1998140), (20, 999070), (25, 799256), (40, 499535), (50, 399628), (100, 199814), (200, 99907)]