At a media briefing, Kwatra said Modi and other leaders will discuss issues relating to global economy, energy, environment, digital transformation, etc.
Kwatra said Modi will have a number of bilateral meetings with some of the G20 leaders.
The prime minister is attending the summit at the invitation of Indonesian President Joko Widodo.
The G20 or Group of 20 is an intergovernmental forum of the world’s major developed and developing economies.
It comprises Argentina, Australia, Brazil, Canada, China, France, Germany, India, Indonesia, Italy, Japan, the Republic of Korea, Mexico, Russia, Saudi Arabia, South Africa, Turkey, the UK, the US and the European Union (EU).
The G20 is the premier forum for international economic cooperation representing around 85 per cent of the global GDP, over 75 per cent of the global trade, and about two-thirds of the world population.
India is currently part of the G20 Troika (current, previous and incoming G20 Presidencies) comprising Indonesia, Italy and India.