0
20736^(1/4) = 12.
Ie 12^4 = 20736.
20736
144
the answer is 144
the square of 144 = 144 x 144 = 20736 is the way to think of it
not easy if you have not got a calculator
6912 x 1 = 6912
6912 x 3 = 20736