1) Calculable 2) Countable 3) Enumerable 4) Numerable 5) That can be counted 
denumerable, denumerability 1. Capable of being put into one-to-one correspondence with the positive integers; countable. 2. That which can be counted; 'countable sins'; 'numerable assets'; synonyms: countable, enumerable, numerable.
countable (def. 2b).