You can not convert that as 20 inches are LENGTH and Square Feet is AREA
If you meant 20 square inches however then...
1 square foot is 12 * 12 or 144 square inches.
so 20 square inches would be 20/144 or 0.139 square feet
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20/12*20/12 = 25/9 square feet
2.22 square feet.
25 square feet.
= ( 20/12) x (42/12) sq feet
There are 144 sq. inches in a sq. foot, so 144 x 20 = 2880 sq. inches