Diplomatic sources said several world leaders were particularly keen to listen to the Indian prime minister, the Oxford-educated economist who had fashioned the country's economic reforms in the early 1990s as finance minister.
A member of the Indian delegation said told that President Obama walked up to Prime Minister Manmohan Singh and spoke to him for almost 10 minutes.
US President Barack Obama meets India's Prime Minister Manmohan Singh during their bilateral meeting at the G20 Summit in London, April 2, 2009.
US first lady Michelle Obama (R) talks with Gursharan Kaur, wife of Indian Prime Minister Manmohan Singh, during a G20 spouses visit to the Royal Opera House in London, April 2, 2009.
Prime Minister Manmohan Singh told Obama his daughters asked him for a favour before he came to London that he request him for his autograph on their books.
This was the first time when the two leaders came face to face after Barack Obama assumed the office on January 20.
US President Barack Obama(R) speaks with India's Prime Minister Manmohan Singh (L) during a reception for G20 leaders at Buckingham Palace in London.