20779978

素因数分解:

$2^1\times {\mathrm{109}}^1\times {\mathrm{199}}^1\times {\mathrm{479}}^1$

素因数の和:789

約数の個数: 16

約数和(自身を含む): 31680000

約数和(自身を除く): 10900022

約数列:

[1, 2, 109, 199, 218, 398, 479, 958, 21691, 43382, 52211, 95321, 104422, 190642, 10389989, 20779978]

約数ペア:

[(1, 20779978), (2, 10389989), (109, 190642), (199, 104422), (218, 95321), (398, 52211), (479, 43382), (958, 21691)]