What is 20 of 500?

Without knowing the specific context or subject matter of the 500 items you mentioned, I will provide some general information about the number 20.

1. Numerical Value: 20 is an integer that falls between 19 and 21.
2. Odd or Even: It is an even number.
3. Factors: The factors of 20 are 1, 2, 4, 5, 10, and 20.
4. Divisibility: 20 is divisible by numbers 1, 2, 4, 5, 10, and 20.
5. Prime or Composite: It is a composite number as it has factors other than 1 and itself.
6. Roman Numeral: 20 is represented as "XX" in Roman numerals.
7. Binary Code: In binary code, it is written as 10100.
8. Ordinal Form: In its ordinal form, it is written as 20th.
9. Square Number: 20 is not a square number as it does not have an integer square root.
10. Mayan Numerals: In Mayan numerals, 20 is represented as four dots in a horizontal line (////).
11. Atomic Number: The element calcium has the atomic number 20.
12. 20/20 Vision: In terms of eyesight, having 20/20 vision means normal or perfect eyesight.
13. Twentieth Amendment: The Twentieth Amendment to the United States Constitution sets the date for the presidential inauguration as January 20th.
14. Human Body Temperature: 20 degrees Celsius is equivalent to 68 degrees Fahrenheit, which is slightly below normal body temperature for humans.
15. Age: In many cultures, turning 20 marks the end of teenage years and the transition into adulthood.
16. Number of Faces on a Dodecahedron: A dodecahedron is a three-dimensional geometric shape with 20 faces.
17. Number of Weeks in a Score: A score refers to 20 years, so it consists of 20 sets of weeks.
18. World Population: As of 2021, the world population is estimated to be around 7.9 billion, meaning that 20 out of 500 would represent a small portion of the global population.
19. Number of Toes: Humans typically have 10 toes, meaning that 20 toes would indicate two people.
20. Olympic Games: The Summer Olympics were scheduled to take place in 2020, but due to the COVID-19 pandemic, they were postponed to 2021.

These are just a few general pieces of information related to the number 20.