The answer will depend on the units used for "20x16x14". Are they feet, inches, miles, metres, micrometres?
Since you cannot be bothered to provide that information, it is not possible to provide a sensible answer.
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Volume is 8.25 x 20.75 x 13.50 = 2311.03 cubic inches
1 cubic foot = 12 x 12 x 12 = 1728 cubic inches
Therefore 2311.03 cubic inches = 2311.03/1728 = 1.3374 cubic feet