un - deux - trois - quatre - cinq - six - sept - huit - neuf - dix - onze - douze - treize - quatorze - quinze - seize - dix-sept - dix-huit - dix-neuf - vingt
These are the prime numbers 1-20 2,3,5,7,11,13,17,19
The numbers 1-20 are on a dart board so there are twenty numbers.
20 and 1. 20 + 1 = 21 20 - 1 = 19
The sum of the numbers from 1 to 20 inclusive is 220.
2/5 of the numbers from 1 to 20 are prime numbers
The square numbers between 1 and 20 are 1,4,9 and 16.
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.
1000001
101
20 contre 1 / vingt contre un
The numbers are: -1 and -20
All whole numbers between 1 and 400 (=20 square).