1990000

素因数分解:

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

素因数の和:227

約数の個数: 50

約数和(自身を含む): 4842200

約数和(自身を除く): 2852200

約数列:

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

約数ペア:

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