3980000

素因数分解:

$2^5\times 5^4\times {\mathrm{199}}^1$

素因数の和:229

約数の個数: 60

約数和(自身を含む): 9840600

約数和(自身を除く): 5860600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 199, 200, 250, 398, 400, 500, 625, 796, 800, 995, 1000, 1250, 1592, 1990, 2000, 2500, 3184, 3980, 4000, 4975, 5000, 6368, 7960, 9950, 10000, 15920, 19900, 20000, 24875, 31840, 39800, 49750, 79600, 99500, 124375, 159200, 199000, 248750, 398000, 497500, 796000, 995000, 1990000, 3980000]

約数ペア:

[(1, 3980000), (2, 1990000), (4, 995000), (5, 796000), (8, 497500), (10, 398000), (16, 248750), (20, 199000), (25, 159200), (32, 124375), (40, 99500), (50, 79600), (80, 49750), (100, 39800), (125, 31840), (160, 24875), (199, 20000), (200, 19900), (250, 15920), (398, 10000), (400, 9950), (500, 7960), (625, 6368), (796, 5000), (800, 4975), (995, 4000), (1000, 3980), (1250, 3184), (1592, 2500), (1990, 2000)]