203
203 is a Bell number.
- Odd
- Composite
Where 203 fits
Why 203 is special
Bell numbers count the ways a set can be partitioned into groups. Five items can be grouped 52 ways and six items 203, which is why splitting a small team into subgroups has more options than people expect.
203 is part of
Factors & digit properties
- Divisors (4)
- 1, 7, 29, 203
- Prime factorisation
- 7 × 29
- Digit sum
- 5
- Digital root
- 5
Representations
- Decimal
- 203
- Binary
- 11001011
- Octal
- 313
- Hexadecimal
- cb
- Roman numeral
- CCIII
- Scientific notation
- 2.030 × 10^2
Other mathematical patterns
- Deficient number
- Happy number
- Semiprime
Mathematics
203 is the number of ways to partition six items into groups. The count grows explosively — ten items have 115,975 partitions — which is why team-splitting problems resist enumeration quickly.
DocumentedMathematics
Common questions
Is 203 a prime number?
No, 203 is not prime.
What are the factors of 203?
The factors of 203 are 1, 7, 29, 203.
What is 203 in Roman numerals?
203 in Roman numerals is CCIII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026