


Cardinal  ten  
Ordinal  10th (tenth) 

Numeral system  decimal  
Factorization  2 × 5  
Divisors  1, 2, 5, 10  
Roman numeral  X  
Roman numeral (unicode)  X, x  
Greek prefix  /  
Latin prefix  
Binary  1010_{2}  
Ternary  101_{3}  
Quaternary  22_{4}  
Quinary  20_{5}  
Senary  14_{6}  
Octal  12_{8}  
Duodecimal  A_{12}  
Hexadecimal  A_{16}  
Vigesimal  A_{20}  
Base 36  A_{36}  
Chinese numeral  十，拾  
Hebrew  י (Yod)  
Khmer  ១០  
Korean  십  
Tamil  ௰  
Thai  ๑๐  
Devanāgarī  १०  
Bengali  ১০  
Arabic & Kurdish  ١٠ 
10 (ten ^{i}/ˈtɛn/) is an even natural number following 9 and preceding 11. Ten is the base of the decimal numeral system, by far the most common system of denoting numbers in both spoken and written language. The reason for the choice of ten is assumed to be that humans have ten fingers (digits).
Ten is a composite number, its proper divisors being 1, 2 and 5. Ten is the smallest noncototient, a number that cannot be expressed as the difference between any integer and the total number of coprimes below it.
Ten is the second discrete semiprime (2 × 5) and the second member of the (2 × q) discrete semiprime family. Ten has an aliquot sum σ(n) of 8 and is accordingly the first discrete semiprime to be in deficit. All subsequent discrete semiprimes are in deficit. The aliquot sequence for 10 comprises five members (10,8,7,1,0) with this number being the second composite member of the 7aliquot tree.