The G20 (Group of Twenty) consists of 19 countries and the European Union, representing the world's largest economies. Chile is not a member of the G20. Although it is an important economy in South America, it is not part of the official G20 group.
The official G20 members are: Argentina, Australia, Brazil, Canada, China, France, Germany, India, Indonesia, Italy, Japan, Mexico, Russia, Saudi Arabia, South Africa, South Korea, Turkey, the United Kingdom, the United States, and the European Union.