Happily, it’s more than that!  There are 195 United Nations member countries.  146 of them have expressed support at one point or another in the Treaty process – including, early on, North Korea, the only nuclear nation that has ever supported the Treaty negotiations.  135 took part in the Treaty negotiations.  122 adopted the Treaty in July 2017.  57 have signed it, and 7 have ratified it (as of April 1, 2018).  You can follow who has signed and ratified here.