Hey check this out
("In 2014, according to the CIA's World Factbook, the GWP totalled approximately US$107.5 trillion in terms of purchasing power parity (PPP), and around US$78.28 trillion in nominal terms. The per capita PPP GWP in 2014 was approximately US$16,100 according to the World Factbook")

107.5 trillion divided by 21 million = 5,119,047 PER BITCOIN BY 2020 give or take a million  and now I have the math to prove it BTCBTCBTCBTCBTCBTCBTCBTCBTCBTCBTCBTCBTCBTCBTCBTCBTCBTC