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I vaguely remember there is a notion of numbers rich in divisors, i.e. (number of divisors of N)/N is comparatively large. What's their name? Given a number M, how could I find such a number in its neighbourhood?

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    [Primorials](http://en.wikipedia.org/wiki/Primorial) $p_n \#$ have quite some divisors.2012-09-24

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