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To get the Least Common Multiple (LCM) of 20736 and 576 we need to factor each value first and then we choose all the factors which appear in any column and multiply them:
|576: ||2||2||2||2||2||2|| || ||3||3|| || |
The Least Common Multiple (LCM) is: 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 x 3 x 3 x 3 x 3 = 20736