You can't because there's no one answer. There are an infinite number of different
shapes with different dimensions that all have the same area of 20 acres.
-- If the field is a circle, then it's 1,053.2 feet across, and the perimeter is 3,308.7 feet.
That's the shortest perimeter it can have.
-- If it's square, then each side of the square is 933.4 feet, and the perimeter is 3,733.5 feet.
That's the shortest perimeter it can have if the sides are straight.
-- If it's a rectangle, then the perimeter can be anything more than 3,733 feet.
Here are a few examples. They're all 20 acres:
121 x 7200 . . . . . perimeter = 14,642-ft
242 x 3600 . . . . . perimeter = 7,684-ft
300 x 2904 . . . . . perimeter = 6,408-ft
363 x 2400 . . . . . perimeter = 5,526-ft
484 x 1800 . . . . . perimeter = 4,568-ft
600 x 1452 . . . . . perimeter = 4,104-ft
726 x 1200 . . . . . perimeter = 3,852-ft
800 x 1089 . . . . . perimeter = 3,778-ft
900 x 968 . . . . . . perimeter = 3,736-ft
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20 acres is 871,200 square feet.
43,560 square feet per acre: 20 (acres) x 43,560 = 871,200 square feet
A square with an area of 20 acres has a perimeter of about 3,733.5 feet.
871,200 square feet.
A 20-acre square lot has a perimeter of 3,733.52 feet.