9980000

素因数分解:

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

素因数の和:529

約数の個数: 60

約数和(自身を含む): 24601500

約数和(自身を除く): 14621500

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 499, 500, 625, 800, 998, 1000, 1250, 1996, 2000, 2495, 2500, 3992, 4000, 4990, 5000, 7984, 9980, 10000, 12475, 15968, 19960, 20000, 24950, 39920, 49900, 62375, 79840, 99800, 124750, 199600, 249500, 311875, 399200, 499000, 623750, 998000, 1247500, 1996000, 2495000, 4990000, 9980000]

約数ペア:

[(1, 9980000), (2, 4990000), (4, 2495000), (5, 1996000), (8, 1247500), (10, 998000), (16, 623750), (20, 499000), (25, 399200), (32, 311875), (40, 249500), (50, 199600), (80, 124750), (100, 99800), (125, 79840), (160, 62375), (200, 49900), (250, 39920), (400, 24950), (499, 20000), (500, 19960), (625, 15968), (800, 12475), (998, 10000), (1000, 9980), (1250, 7984), (1996, 5000), (2000, 4990), (2495, 4000), (2500, 3992)]