998000

素因数分解:

$2^4\times 5^3\times {\mathrm{499}}^1$

素因数の和:522

約数の個数: 40

約数和(自身を含む): 2418000

約数和(自身を除く): 1420000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 499, 500, 998, 1000, 1996, 2000, 2495, 3992, 4990, 7984, 9980, 12475, 19960, 24950, 39920, 49900, 62375, 99800, 124750, 199600, 249500, 499000, 998000]

約数ペア:

[(1, 998000), (2, 499000), (4, 249500), (5, 199600), (8, 124750), (10, 99800), (16, 62375), (20, 49900), (25, 39920), (40, 24950), (50, 19960), (80, 12475), (100, 9980), (125, 7984), (200, 4990), (250, 3992), (400, 2495), (499, 2000), (500, 1996), (998, 1000)]