It is a negative whole number which is the same as an integer
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even, whole, non-negative numbers. (zero is not a natural number)
All integers are whole numbers. The natural numbers are zero and the positive integers. Thus, any negative integer (-1, -2, -3, etc.) is whole but not "natural."
Zero is a member of the set of whole numbers. Some people include it in the set of natural numbers, some people don't.
No, -7.3 is not a natural number. Natural numbers are whole numbers greater than zero, so they cannot be negative or contain decimals. The set of natural numbers is typically denoted as {1, 2, 3, ...}. Negative numbers and decimals fall under different categories, such as integers and real numbers, respectively.
Yes, -21 < -20