I would say it is correct, but it would sound incomplete without further context. Which president [of the countries in G20 summit] is Mr. Obama?
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Mister MicawberThat is not what mudclay is looking for, Anon, but mudclay should now realize that the question is vague. Answers could include: the current one, the president of the United States, the first Afro-American one, etc.There is no clear way to ask about his position in the series of presidents, mudclay. English has no neat question for ordinal numbers.
Grammar GeekWe don't have a "How manieth is he?" or "Whicheth is he?"Great, GG!
Mister MicawberDid you read GG's post, muddy?