I'm trying to input this formula into the calculator but it won't work.\(((20^3)\times(20^2)\times(20^1))\times((20\times-20\times(20))\times(20\times-20)\times(20))\)

Let's just simplify this :

( 20^3 x 20^2 x 20^1) x [ ( 20 x -20 x 20 ) x (20 x -20) x 20 ] =

( 20^6 ) x [ ( - 8000) x ( - 8000 ) ] =

20^6* (-8000)^2 =

4,096,000,000,000,000