2 May 2013

Factors of 12345654321: Upper Secondary Mathematics Competition Question

This is probably the shortest question I've ever posted.

How many distinct factors divide 12345654321 exactly?

Include 1 and the number itself as factors and, of course, we're only looking at positive integers.

This is supposed to be done by hand within a timed competition – calculators should not be used, and should not be necessary!

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