Yes, These two ways of reporting the scale the same time.
The map in the picture reported that the scale is 1 inch to 20 miles or 1 inch to 1,267,200.
We have to find two ways of reporting the scale the same.
value of inch in a mile?
You need to know that:
There are 63,360 inches in 1 mile.
So in 20 miles;
20 x 63,360 = 1,267,200
These two ways of reporting the scale