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400 of course !
Google will do these conversion for you automatically.Key in: convert 631501.87 sq feet to sq metersThe answer pops out: 58,668.4435 sq meters
20-ft x 20-ft = (20-ft)2 = 400 ft2
400 sq. miles = 27,878,400 sq. ft. x 100 = 2,787,840,000 sq. ft.
20 ft x 20 ft = 400 sq ft.