20361680

素因数分解:

$2^4\times 5^1\times {\mathrm{199}}^1\times {\mathrm{1279}}^1$

素因数の和:1491

約数の個数: 40

約数和(自身を含む): 47616000

約数和(自身を除く): 27254320

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 199, 398, 796, 995, 1279, 1592, 1990, 2558, 3184, 3980, 5116, 6395, 7960, 10232, 12790, 15920, 20464, 25580, 51160, 102320, 254521, 509042, 1018084, 1272605, 2036168, 2545210, 4072336, 5090420, 10180840, 20361680]

約数ペア:

[(1, 20361680), (2, 10180840), (4, 5090420), (5, 4072336), (8, 2545210), (10, 2036168), (16, 1272605), (20, 1018084), (40, 509042), (80, 254521), (199, 102320), (398, 51160), (796, 25580), (995, 20464), (1279, 15920), (1592, 12790), (1990, 10232), (2558, 7960), (3184, 6395), (3980, 5116)]