I haven't been with or seen my wife in 20 years need to get a divorce the quickest and cheapest way. What would you suggest?

Your question cannot be answered in this forum, without additional information.  I suggest that you set up an initial consultation with an experienced family lawyer in your area to discuss all options that are available to you.  Most lawyers charge by the hour; therefore, you should discuss the cost of an initial consult to avoid any misunderstandings concerning fees.  Best of luck~