The Collaborative International Dictionary of English v.0.48:

Numerable \Nu"mer*a*ble\, a. [L. numerabilis. See Number, v.
   t.]
   Capable of being numbered or counted.
   [1913 Webster]

WordNet (r) 3.0 (2006):

numerable
    adj 1: that can be counted; "countable sins"; "numerable assets"
           [syn: countable, denumerable, enumerable,
           numerable]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "numerable":
   appraisable, appreciable, assessable, calculable, computable,
   countable, determinable, estimable, fathomable, gaugeable,
   measurable, mensurable, meterable, noticeable, numberable,
   perceptible, quantifiable, quantizable, reckonable