20 in Roman numerals

20 = XX

Working: X = 10, X = 10

The number 20 is written as XX in Roman numerals.

Roman numerals are built by adding symbol values together from largest to smallest: X = 10, X = 10. Where a smaller symbol appears before a larger one — as in IV for 4 or IX for 9 — it is subtracted rather than added, which keeps the notation short.

Structurally, XX is 2 symbols long. It is entirely additive: every symbol adds to the running total, with no smaller symbol standing before a larger one. The longest run is 2 identical symbols.

XX is two tens and one of the cleanest numerals in the system. It marks the start of the twenties, where the one-to-nine pattern repeats again on top of a doubled X — the same structure as the teens, one level up.

Nearby numbers

Number	Roman numeral
11	XI
12	XII
14	XIV
15	XV
16	XVI
18	XVIII
19	XIX
25	XXV

Try another value

Decimal number (1–3999)

Roman numeral

MMXXIV

Reference

X10

L50

C100

D500

M1000

Frequently asked questions

How do you write 20 in Roman numerals?

20 is written XX. It breaks down as X = 10, X = 10.

What are the seven Roman numeral symbols?

I is 1, V is 5, X is 10, L is 50, C is 100, D is 500, and M is 1,000. All Roman numerals are combinations of these seven symbols, and there is no symbol for zero.

For any other value, use the full Roman Numeral Converter on BrainVert.