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20 cubes
64
Infinitely many.
A rectangular prism that is 4 cubes by 2 cubes is made up of 8 cubes.
24 of them
18
You could try 14!
20 cubes
64
its 3
Infinitely many.
-4
A rectangular prism that is 4 cubes by 2 cubes is made up of 8 cubes.
about 10
24 of them
25
It depends on the size of the unspecified cube size, and what and how they are to be used? More information is needed.