Study the following letter – symbol – number series and the answer then questions given below it:

5 8 # B F L E 4 * M J 9 G N 2 W 3 + S 4 ? $ P Q 6 R 7 & H T

If the positions of 1st and 16th elements, 2nd and 17th elements and so on upto 15th and last elements are interchanged, which letter / number / symbol will be 16th to the right of 20th letter /number / symbol from the right?