23
23 is the number of chromosome pairs in a typical human cell (46 total) and the atomic number of vanadium.
- Odd
- Prime
Where 23 fits
Why 23 is special
23's two best-known associations are both exact scientific identifiers rather than mathematical properties: it's the atomic number of vanadium (its fixed proton count), and it's the number of chromosome pairs a typical human somatic cell contains — a biological fact specific to our species, corrected from an earlier, mistaken count of 24 pairs that was widely accepted until 1956.
Not just a mathematical number
23is also used in ways where ordinary arithmetic doesn't apply — each listed below with what genuinely does and doesn't follow from it.
- Mathematical number
A genuine quantity — its mathematical properties (prime, square, factors, and so on) are real facts about it.
A genuine quantity that ordinary arithmetic applies to — it can be prime, even, a perfect square, added to another number meaningfully, and so on.
- Quantity
Also used as a quantity — Adult human skeleton.
A genuine count or amount of something — closest to a pure mathematical number, but tied to what's being counted (12 eggs is a genuine amount of eggs, not an abstract mathematical fact about the number 12).
23 in Numbers Around Us
23 is part of
Factors & digit properties
- Divisors (2)
- 1, 23
- Prime factorisation
- 23
- Digit sum
- 5
- Digital root
- 5
Representations
- Decimal
- 23
- Binary
- 10111
- Octal
- 27
- Hexadecimal
- 17
- Roman numeral
- XXIII
- Scientific notation
- 2.300 × 10^1
Other mathematical patterns
- Deficient number
- Happy number
- Sophie Germain prime
- Safe prime
Related numbers & connections
23 is a factor of 46 (23 × 2 = 46) — the number of human chromosome pairs and the resulting total chromosome count.
View 46 →23 is the atomic number of vanadium.
A typical human somatic cell has 23 pairs of chromosomes (46 total).
Mathematically related
Scientific association
- has scientific association withVanadium (chemical element)
why?
Strength 0.50, confidence "high".
Numbers Around Us
- appears inAdult human skeleton
why?
Strength 0.50, confidence "high".
Science
23 is the atomic number of vanadium, a transition metal used mainly in steel alloys.
DocumentedScience23 is the atomic number of vanadium, a transition metal used mainly in steel alloys.
DocumentedScience
Common questions
Is 23 a prime number?
Yes, 23 is prime — it has exactly two positive divisors: 1 and itself.
What are the factors of 23?
The factors of 23 are 1, 23.
What is 23 in Roman numerals?
23 in Roman numerals is XXIII.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 2 reviewer-confirmed records, sourced and reviewed before publication.
Last reviewed: 15 July 2026