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"We can do a really good job here at home, with a whole host of policies, but if you continue to see deterioration in the world economy, that's going to set us back," Obama said during a meeting at the White House with Treasury Secretary Timothy Geithner.
Geithner will leave for London late this week to attend a G20 finance minister meeting and to prepare the way for the leaders' summit on April 2.
"It's time now for us to move together and to begin to act," said Geithner. "Everything we do in the United States will be more effective if we have the world moving with us."
Obama said the U.S. has two goals in the G20 summit. "The first is to make sure that there is concerted action around the globe to jump-start the economy. The second goal is to make sure that we are moving forward on a regulatory reform agenda," he said.
"I am actually optimistic about the prospects -- everybody understands, we are in this together," Obama said, adding the G20 needed to work together to see how they can make sure emerging and developing nations "remain stable."
"The United States has actually taken a significant lead on a number of these steps that are required," said the president.
"As aggressive as the actions we are taking have been so far, it's very important to make sure that other countries are moving in the same direction, because the global economy is all tied together," he added.