398000

素因数分解:

$2^4\times 5^3\times {\mathrm{199}}^1$

素因数の和:222

約数の個数: 40

約数和(自身を含む): 967200

約数和(自身を除く): 569200

約数列:

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

約数ペア:

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