A tinsmith wants to make a small windowsill planter from a 62cm×20cm 62
⁢
cm
×
20
⁢
cm
sheet of copper. She’ll form it by cutting equally sized squares from each of the four corners of the sheet, folding up the resulting flaps to form the sides of the planter, and then soldering the four vertical edges. What is the maximum possible volume of the planter? Round your answer to the nearest whole number.