i dont know 20
there were only two countries that competed in the first official summer games. Canada and the USA. also only 26 states competed from the USA. it was held on July 19 & 20, 1968.
59
88 countries competed in the 2010 olympics.
204
4,955 athletes from 69 countries competed in the 1952 Summer Games in Helsinki.
82 nations.
one
10,820 athletes from 204 countries competed in the 2012 London Olympics.
The first modern Olympics were held in 1896. Fourteen countries sent representatives to compete in this male only Olympics in Athens.
2,566 athletes from 82 different nations competed at the 2010 Olympics.
100
There were two Olympics in 1988 Summer Olymics Seoul Games, 160 nations competed and 8391 athletes Winter Olympics Calgary '88, 57 nations competed and 1,423 athletes