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23 in Roman Numerals

23 in Roman numerals is XXIII. It breaks down as XX + III, which adds up to 20 + 3 = 23.

  • Roman numeral
    XXIII
  • Lowercase
    xxiii
  • Breakdown
    XX + III
  • In words
    twenty-three
  • Binary
    10111
  • Hexadecimal
    17

How to write 23 in Roman numerals

Roman numerals are built place by place, from the largest value to the smallest. For 23 the places are 20 (tens), 3 (ones).

  1. Write 20 as XX.
  2. Write 3 as III.

Joined together, XX + III gives XXIII.

23 digit by digit

PlaceValueNumeralRule used
tens20XXthe symbol repeated twice
ones3IIIthe symbol repeated three times (the limit)

Check XXIII by reading it back

Reading XXIII from left to right and adding the pieces: XX = 20, III = 3. Together that is 20 + 3 = 23, so XXIII and 23 match.

Mistakes to avoid with XXIII

  • Never repeat a symbol more than three times in a row. When a fourth would be needed, the subtractive form takes over.
  • Only I, X and C may be placed before a larger symbol to subtract, so XXIII never contains forms such as VX or LC.
  • Read XXIII as one number, not letter by letter: add the values left to right, except where a smaller symbol sits before a larger one.

Facts about the number 23

  • 23 is an odd number and a prime number.
  • In binary 23 is 10111 and in hexadecimal it is 17.
  • Written out, 23 is "twenty-three".
  • The digits of 23 add up to 5.

Where you will see 23 in Roman numerals

The number 23 appears as XXIII in historical timelines denoting the twenty third century or past monarchs. Sports jerseys occasionally feature it. Teams and historians use this five letter sequence because Roman numerals provide a distinct visual identity that separates special designations from everyday roster statistics.

Numbers near 23

NumberRoman numeral
21XXI
22XXII
23XXIII
24XXIV
25XXV

FAQ

What is 23 in Roman numerals?

23 is written XXIII in Roman numerals. It is built from XX (20), III (3).

How do you write 23 in lowercase Roman numerals?

Lowercase Roman numerals use the same rules, so 23 is xxiii. Lowercase is common for page numbers in a book's preface and for outline levels.

How do I convert any number to Roman numerals?

Split the number into thousands, hundreds, tens and ones, write each part with the symbols I, V, X, L, C, D and M, then join them from largest to smallest. Or paste it into the Roman numeral converter, which also converts back.

More roman numerals