18745960

素因数分解:

$2^3\times 5^1\times {\mathrm{661}}^1\times {\mathrm{709}}^1$

素因数の和:1381

約数の個数: 32

約数和(自身を含む): 42301800

約数和(自身を除く): 23555840

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 661, 709, 1322, 1418, 2644, 2836, 3305, 3545, 5288, 5672, 6610, 7090, 13220, 14180, 26440, 28360, 468649, 937298, 1874596, 2343245, 3749192, 4686490, 9372980, 18745960]

約数ペア:

[(1, 18745960), (2, 9372980), (4, 4686490), (5, 3749192), (8, 2343245), (10, 1874596), (20, 937298), (40, 468649), (661, 28360), (709, 26440), (1322, 14180), (1418, 13220), (2644, 7090), (2836, 6610), (3305, 5672), (3545, 5288)]