$20K for bitcoin is not a big deal and I believe that it will touch $40k by the end of this year without a doubt. Reasons behind why I think this will happen are the integration of the lightning network which will bring down the transaction times and transaction fees which will obviously attract many investors. Also, more and more people are beginning to adopt segwit technology which will again cut down the transaction fees and time attracting even more investors. On top of all this, I am expecting a huge rally soon just like last year(No specific reason for this).