The counting numbers from 1 to 20 are called natural numbers.
There are larger sets that include the numbers from 1 to 20, but have other members as well.
For example, the integers contain 1 through 20, but also all numbers 21, 22, 23, ...
The set of real numbers includes all numbers on the number line, which includes 0 and negative numbers and Irrational Numbers like pi, but also includes 1 through 20. Etc.
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