What is the symbol of natural number?

The symbols of natural numbers are as follows:

1, n: non-negative integer set or natural number set {0, 1, 2,3, ...}.

2, N* or N+: positive integer set {1, 2, 3, …}.

3, z: integer set {…,-1, 0, 1, …}.

4. Q: Rational number set.

5.Q+: the set of positive rational numbers.

6.Q-: set of negative rational numbers.

7.r: set of real numbers (including rational numbers and irrational numbers).

Divide by the number of factors

It can be divided into prime number, composite number, 1 and 0.

1, prime number: only 1 and its own natural number are called prime numbers. Also known as prime numbers.

2. Composite number: a natural number with other factors besides 1, which is itself called a composite number.

3. 1: There are only 1 factors. It is neither a prime number nor a composite number.

4, of course, 0 can't calculate the factor, just like 1, which is neither a prime number nor a composite number.

Note: This is a factor, not a divisor.