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I need to know the total possible unique variations there can be on an identifier that is made up of 20 alphanumeric characters, where the characters are A to Z (all upper case), and the digits 0 to 9.

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    What do you mean by 'variations' and 'identifier' here? Are you looking for the number of ways that you can form a string of $20$ characters from A-Z and 0-9?2012-09-27
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    Yes. I am referring to the 'LEI' or "legal entity identifier' that all hedge funds must start using. It consist of the letters A through Z and the numbers 0 to 9. I was wondering on how many permutations there are. It looks like I already have my answer, thanks to all!2012-09-27
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    Does anybody know what number this would be i.e. million, billion, trillion etc?2012-09-27
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    13.36 nonillion2012-09-27

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