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 US gallons is 3,072 ounces.
24 cups is 1.5 gallons.
there are 24 vertices's in a truncated cube
A truncated cube has 24 vertices.
24 liters = 5.279 imperial gallons
24 quarts.
A cube has 24 corners and 6 faces.
There are 4 quarts in a gallon, so you already have 24 quarts.
24
24
There are 4 US quarts in 1 US Gallon. So in 24 gallons there are 96 quarts.
twelve