Would be surprised if he didnt get 20+. Ovechkin have been incredibily snakebitten and only 6,2 % shooting percentage (Last 5 years: 14,3 % - 15 % - 13,2 % - 15,4 % - 15,1 % average 14,7 %). Hes no longer a 50+ scorer, but with his average shooting percentage over the last 5 years he would have had around 19 goals so far.
Then there definetely could be some problems with his shot and that it isnt the same so its natural decline in goalscoring. His shot power is still around the same so then the question is if he is no longer able to put the puck in the top corner etc and instead are hitting straight at the goalie or if he doesnt get of the shot fast enough letting the goalie get in place.
Still even with decline 6,2 % seems low and with a increase to like 10 % he should look at 25-30 goals this year.