This year's Summer Olympic Games will take place in Tokyo, as Japan has succeeded, even after the Fukushima plant catastrophe, to win the bid for the 2020 Games in 2013. The inaugural Summer Olympic Games in 1964 were held in Tokyo, followed by Sapporo in 1972 and Nagano in 1998. Thus, it is the fourth time in history that Japan has hosted the Olympic Games.

The Olympic Stadium will be the main venue for the opening and closing ceremonies, as well as for the track and field events, and several soccer matches. Prior to the beginning of the Summer Olympics, Japan's National Olympic Stadium, which hosted the 1964 Games, was rebuilt and upgraded.

In keeping with changes in trends, the evolution of existing sports, as well as the popularity of a specific discipline in the host nation, the International Olympic Committee (IOC) updates the Olympic program for each edition. Tokyo 2020 will have the largest program to date, with 33 sports and 339 events. In comparison, the first Olympic Games in Athens in 1896 featured only nine sports and 43 events.

How many athletes are in the Olympics?

Athletes walk with their flags at the 2016 Rio de Janeiro Games. (Getty)

Tokyo 2020 will have 11,260 athletes of 205 National Olympic Committees, with 51 percent male, and 49 percent female gender equality. However, women represent just 40.5 percent of the Paralympics competitors. Some competitors had even pulled off the event. For example, after the decision to prohibit supporters and limit the number of people players can take with them to the Games, Serbian tennis player Novak Djokovic had been hesitant whether to feature or not. However, eventually, he opted to compete at the Summer Olympic Games.

A total of 613 athletes come from the United States, 329 female, and 284 men competitors. The US has more women than men for the third time in history and for the third Summer Olympics in a row. The share of women, at 54 percent, is the largest ever in American history. There are 100 medalists on the US roster, including 54 gold medalists. The host Japan will field 552 athletes, followed by Australia with 478. Meanwhile, 425 competitors will represent Team Germany, 406 will play for Team China, and 398 will proudly feature for France.

The top 10 list of the countries with the most athletes in the Olympics complete Great Britain with 372, four less than France; Italy with 372, Canada with 320, and 328 athletes will represent the Russian Olympic Committee. Interestingly, Andorra, Somalia, Bermuda, Tuvalu, Central African Republic, Dominica, Mauritania, Nauru, and South Sudan are the countries that have sent the least number of athletes to Tokyo (2 each).