Explanation:

The G20 (or Group of Twenty) is an international forum for the governments and central bank governors from 19 countries and the European Union. It was founded in 1999 with the aim to discuss policy pertaining to the promotion of international financial stability.
Members: The G20, short for “Group of 20”, is made up of 19 countries: Argentina, Australia, Brazil, Canada, China, France, Germany, India, Indonesia, Italy, Japan, South Korea, Mexico, Russia, Saudi Arabia, South Africa, Turkey, the United Kingdom and the United States, plus the European Union. Spain is a permanent guest and always participates in the G20 summits.