It depends on whether it is 24 inches * 24 inches * 20 inches or 24 metre * 24 metres * 20 metres or any other unit for measuring length, and it would be futile for me to guess what you mean.
24 cups is 1.5 gallons.
24 US gallons is 3,072 ounces.
24 liters = 5.279 imperial gallons
A truncated cube has 24 vertices.
there are 24 vertices's in a truncated cube
24 pints is equal to 3 gallons.
24 quarts.
There are 4 quarts in a gallon, so you already have 24 quarts.
A cube has 24 corners and 6 faces.
24
24
There are 4 US quarts in 1 US Gallon. So in 24 gallons there are 96 quarts.