"Our space programme has time and again shown the transformative potential of science & technology in people's lives," he said on twitter.
"Over the years we developed expertise & capability to help other nations in their space initiatives. This is the skill of our scientists," he said.
The Prime Minister congratulated space agency ISRO for breaking new barriers.
"20 satellites in a go! @isro continues to break new barriers. Hearty congratulations to our scientists on the monumental accomplishment," he said.
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"Saw with immense joy that students from institutions in Pune & Chennai played a role in the making of satellites. This touched me.
(Reopens DEL12)
Congress President Sonia Gandhi also congratulated the scientists and staff of ISRO for the successful launch.
"The fact that of the 20, 17 satellites belonged to foreign vendors including that from the US and Google speaks volumes about the leaps in progression that ISRO has taken since its inception in 1960's," she said in a message.