What is a natural Divisor?

Answer 1

Since this is not my area of expertise, I searched Google under the key words "'natural divisor' math define" to get these possible sources:

http://www.physicsforums.com/archive/index.php/t-164611.html
http://www.thirty-thousand.org/pages/Neubauer-Zeitlin.htm

I hope this helps. Thanks for asking