3998000

素因数分解:

$2^4\times 5^3\times {\mathrm{1999}}^1$

素因数の和:2022

約数の個数: 40

約数和(自身を含む): 9672000

約数和(自身を除く): 5674000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 500, 1000, 1999, 2000, 3998, 7996, 9995, 15992, 19990, 31984, 39980, 49975, 79960, 99950, 159920, 199900, 249875, 399800, 499750, 799600, 999500, 1999000, 3998000]

約数ペア:

[(1, 3998000), (2, 1999000), (4, 999500), (5, 799600), (8, 499750), (10, 399800), (16, 249875), (20, 199900), (25, 159920), (40, 99950), (50, 79960), (80, 49975), (100, 39980), (125, 31984), (200, 19990), (250, 15992), (400, 9995), (500, 7996), (1000, 3998), (1999, 2000)]