399800

素因数分解:

$2^3\times 5^2\times {\mathrm{1999}}^1$

素因数の和:2015

約数の個数: 24

約数和(自身を含む): 930000

約数和(自身を除く): 530200

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 1999, 3998, 7996, 9995, 15992, 19990, 39980, 49975, 79960, 99950, 199900, 399800]

約数ペア:

[(1, 399800), (2, 199900), (4, 99950), (5, 79960), (8, 49975), (10, 39980), (20, 19990), (25, 15992), (40, 9995), (50, 7996), (100, 3998), (200, 1999)]