78720818

素因数分解:

$2^1\times {\mathrm{11}}^1\times {\mathrm{199}}^1\times {\mathrm{17981}}^1$

素因数の和:18193

約数の個数: 16

約数和(自身を含む): 129470400

約数和(自身を除く): 50749582

約数列:

[1, 2, 11, 22, 199, 398, 2189, 4378, 17981, 35962, 197791, 395582, 3578219, 7156438, 39360409, 78720818]

約数ペア:

[(1, 78720818), (2, 39360409), (11, 7156438), (22, 3578219), (199, 395582), (398, 197791), (2189, 35962), (4378, 17981)]