I have said Cotyledon but have doubts. Could confirm please?
Kalanchoe blossfeldiana to my eye.
Definitely not Kalanchoe macrantha, which is a synonym for K. marmorata, the Penwiper Plant.
Once it blooms you can immediately ascertain whether its a Kalanchoe or Cotyledon by the structure of its flowers. I agree with saltcedar that it's most likely a K. blossfeldiana cultivar.
Here is a link that might be useful: Kalanchoe marmorata (syn. K. macrantha)