19996000

素因数分解:

$2^5\times 5^3\times {\mathrm{4999}}^1$

素因数の和:5024

約数の個数: 48

約数和(自身を含む): 49140000

約数和(自身を除く): 29144000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 800, 1000, 2000, 4000, 4999, 9998, 19996, 24995, 39992, 49990, 79984, 99980, 124975, 159968, 199960, 249950, 399920, 499900, 624875, 799840, 999800, 1249750, 1999600, 2499500, 3999200, 4999000, 9998000, 19996000]

約数ペア:

[(1, 19996000), (2, 9998000), (4, 4999000), (5, 3999200), (8, 2499500), (10, 1999600), (16, 1249750), (20, 999800), (25, 799840), (32, 624875), (40, 499900), (50, 399920), (80, 249950), (100, 199960), (125, 159968), (160, 124975), (200, 99980), (250, 79984), (400, 49990), (500, 39992), (800, 24995), (1000, 19996), (2000, 9998), (4000, 4999)]