$$2009=7^{2}\times 41$$, and the average of $$7$$ and $$41$$ is $$(7+41)\div 2=24$$. 
The average of the \emph{different~}prime factors of $$2009$$ is． 
Options:
  * $$2009$$ 
  * $$147$$ 
  * $$48$$ 
  * $$24$$ 