19900720

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{35537}}^1$

素因数の和:35557

約数の個数: 40

約数和(自身を含む): 52880544

約数和(自身を除く): 32979824

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 280, 560, 35537, 71074, 142148, 177685, 248759, 284296, 355370, 497518, 568592, 710740, 995036, 1243795, 1421480, 1990072, 2487590, 2842960, 3980144, 4975180, 9950360, 19900720]

約数ペア:

[(1, 19900720), (2, 9950360), (4, 4975180), (5, 3980144), (7, 2842960), (8, 2487590), (10, 1990072), (14, 1421480), (16, 1243795), (20, 995036), (28, 710740), (35, 568592), (40, 497518), (56, 355370), (70, 284296), (80, 248759), (112, 177685), (140, 142148), (280, 71074), (560, 35537)]