Formula to convert 20.9 liters to gallons is to multiply 20.9 by 0.264172 (this is the value for 1 liter to gallon).
Convert 20.9 Liters to Gallons results
20.9 x 0.264172052 = 5.52119589516
20.9 l = 5.52 gal
To conclude the answer for 20.9 liters is five point fifty two gallons