algebra 2

I'm assuming that you mean:  20^5/2

The "5" is the power; the "2" is the root  --  so, you want  sqrt( 20⁵ )  =  sqrt( 320 000 )

20⁵ / 2  =  3 200 000 / 2  =  1 600 000

20^5/2  =  sqrt( 20⁵ ) / 2  =  sqrt( 3 200 000 ) / 2

not quite I meant 20 raised by 5/2

20^5/2    =  sqrt( 20⁵ )  =  sqrt( 3 200 000 )  =  800 · sqrt( 5 )