There are 9 different answers for the first condition:
http://www.wolframalpha.com/input/?i=Solve+%CF%95%...
The second condition gives you n = 84:
http://www.wolframalpha.com/input/?i=Solve+%CF%84%...
They don't seem to be reconcilable (agreeable) outcomes, so please double-check your problem statement.
If however with tau you meant the number of divisors, then the list of 9 boils down to only 2740 and 2890, which you can verify have 12 divisors each.
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There are 9 different answers for the first condition:
http://www.wolframalpha.com/input/?i=Solve+%CF%95%...
The second condition gives you n = 84:
http://www.wolframalpha.com/input/?i=Solve+%CF%84%...
They don't seem to be reconcilable (agreeable) outcomes, so please double-check your problem statement.
If however with tau you meant the number of divisors, then the list of 9 boils down to only 2740 and 2890, which you can verify have 12 divisors each.