Prime Numbers 1 to 20
Prime numbers from 1 to 20 are the natural numbers greater than 1, divisible only by 1 and themselves. There are a total of 8 prime numbers from 1 to 20. Let us learn how to find the prime numbers between 1 to 20.
| 1. | How to Find Prime Numbers Between 1 to 20? |
| 2. | List of Prime Numbers between 1 to 20 |
| 3. | Important Points on Prime Numbers 1 to 20 |
| 4. | FAQs on Prime Numbers From 1 to 20 |
How to Find Prime Numbers Between 1 to 20?
Prime numbers from 1 to 20 are the numbers that have exactly two factors, 1 and the number itself. To find whether 'x' is a prime number from 1 to 20, we need to check the following conditions:
- Condition 1: The number should be divisible by 1 (x ÷ 1 = x) and the number itself (x ÷ x = 1)
- Condition 2: The number should not have any factors other than 1 and itself.
Let us apply these conditions on different numbers to check whether they are prime numbers or not.
Example 1: Check whether 6 is a prime number or not.
Solution: The number 6 is completely divisible by 1, it is divisible by itself, but it has factors other than 1 and 6. The factors of 6 = 1, 2, 3, and 6. Hence, the number 6 is not a prime number.
Example 2: Check whether 7 is a prime number or not.
Solution: 7 is completely divisible by 1 and 7 and the factors of 7 = 1, 7. Therefore, it is a prime number.
Let us apply the above rules and find the prime numbers from 1 to 20.
List of Prime Numbers between 1 to 20
There are a total of 8 prime numbers from 1 to 20. Observe the chart given below which shows the prime numbers between 1 to 20. All the circled numbers in the following chart are prime numbers, that is, 2, 3, 5, 7, 11, 13, 17, 19.
Prime Numbers from 1 to 10
The prime numbers between 1 to 10 are 2, 3, 5, and 7. These numbers have no other factors other than 1 and itself.
Prime Numbers From 11 to 20
The prime numbers between 11 to 20 are 11, 13, 17, and 19. These numbers have no other factors other than 1 and itself.
The following table shows the list of prime numbers from 1 to 10 and 11 to 20.
| Range | Prime numbers |
|---|---|
| List of Prime numbers from 1 to 10 | 2, 3, 5, 7 |
| List of Prime numbers from 11 to 20 | 11, 13, 17, 19 |
Important Points on Prime Numbers 1 to 20
Some of the important points on prime numbers 1 to 20 are given below:
- Prime numbers 1 to 20 are whole numbers greater than 1.
- Prime numbers 1 to 20 are the numbers with exactly two factors, i.e., 1 and the number itself.
- Amongst the 8 prime numbers between 1 to 20, there is one even prime number, that is, 2.
☛ Related Articles
FAQs on Prime Numbers 1 to 20
What are the Prime Numbers between 1 to 20?
There are 8 prime numbers from 1 to 20. They can be listed as follows: 2, 3, 5, 7, 11, 13, 17, and 19.
What are the Even Prime Numbers from 1 to 20?
The prime numbers from 1 to 20 are 2, 3, 5, 7, 11, 13, 17, and 19. The even number that is a prime number between 1 and 20 is 2. Interestingly, 2 is the only even prime number.
What is the Sum of Odd Prime Numbers Between 1 to 20?
The list of odd numbers that are prime numbers from 1 to 20 are 3, 5, 7, 11, 13, 17, 19. Let us now add them as 3 + 5 + 7 + 11 + 13 + 17 + 19 = 75. So, the sum of all the odd prime numbers from 1 to 20 is 75.
What is the Product of the Last Four Odd Prime Numbers Between 1 to 20?
According to the list of prime numbers 1 to 20, the last four odd prime numbers from 1 to 20 are 11, 13, 17, and 19.
The product of 11, 13, 17, and 19 are,
11 × 13 × 17 × 19 = 46189.
The product of the last four prime numbers from 1 to 20 is 46189.
Which is the Largest Prime Number Between 1 to 20?
There are 8 prime numbers from 1 to 20 listed as follows: 2, 3, 5, 7, 11, 13, 17, and 19. The largest prime number between 1 to 20 is 19.