20451920

素因数分解:

$2^4\times 5^1\times {\mathrm{255649}}^1$

素因数の和:255662

約数の個数: 20

約数和(自身を含む): 47550900

約数和(自身を除く): 27098980

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 255649, 511298, 1022596, 1278245, 2045192, 2556490, 4090384, 5112980, 10225960, 20451920]

約数ペア:

[(1, 20451920), (2, 10225960), (4, 5112980), (5, 4090384), (8, 2556490), (10, 2045192), (16, 1278245), (20, 1022596), (40, 511298), (80, 255649)]