They both can't be compared since they are both units of a different quantity. A square centimetre is a unit of area, a litre is a unit of volume.
If you mean 400 cm3, your question can be answered. A cubic centimetre is one millilitre, so 400 millilitre is 0.4 litre.
400cm2
20 cm
from google2.25 Liters
0.000055 liters
1,000 liters
4 liters
622.97 Liters
2 L
427 liters is 112.8 gallons.
1.5 milliliters is 0.0015 liters.
20 Liters .
20 liters = 5.28344105 gallons 20 liters = 20,000 millilitres or 20000ml.