It could be 497 gallons, depending on the size of the container.
a container that is 20"x20"x10" tall how many gallons will that hold?
A 20-liter container has a volume of about 5.283 US gallons of liquid.
There are 320 cups in 20 gallons. (16 cups in a gallon.)
1 gallon = 16 cups 20 gallons * 16 cups/gallon = 320 cups
Assuming that the given dimensions are inches, it would be 112.2 gallons.
Up to 17.4 gallons.
20 x 20 is only two dimensions, like length and width, but no height, so it wouldn't be able hold any gallons. You have to add the height measurement, and then the measuring distance. Perhaps it is 20 x 20 x 5, but is that inches or feet or cm? The measuring distance is needed to calculate how large the container is.