Answer:
[tex]\frac{1}{20^} ^6[/tex]
Step-by-step explanation:
Depends what you mean
if you mean 2x10^-6 it would be different than (2x10)^-6 but I'll solve for the latter.
[tex](2*10)^-6 = (20)^-6\\20^-6 = \frac{1}{20^6}[/tex]
1/20^6 would just be
[tex]\frac{1}{64000000}[/tex]