DXX in numbers
DXX = 520.
Five hundred twenty written as a Roman numeral.
520 in words: Five hundred twenty
DXX is 520, "five hundred twenty". It is built from D (500) and XX (20), read from the largest value down and added together. Every symbol here is added in sequence, with no subtraction involved.
Put plainly, the numeral DXX in numbers is 520 ("Five hundred twenty"). Type it into the converter above and it reads straight back, which is the fastest way to check a numeral you have found on a clock face, a cornerstone, a film credit or a tattoo before you trust it.
How DXX is built
| Group | Value |
|---|---|
| D | 500 |
| XX | 20 |
| DXX | 520 |
How to read DXX
Roman numerals are read left to right, largest value first, adding as you go. Scanning DXX one group at a time gives a running total that lands on 520:
| Read | Worth | Running total |
|---|---|---|
| D | 500 | 500 |
| XX | 20 | 520 |
There is no subtraction anywhere in DXX, so every letter simply adds to the total. Numerals like this are the easiest to read: no letter changes the meaning of the one next to it.
Where you will see DXX
Counted in order, DXX is the five hundred twentieth number. Read as a year, 520 falls in the 6th century AD. It sits between the round anchors D (500) and DC (600), which is the quickest way to place a numeral of this size at a glance.
Past a hundred, a numeral like DXX shows up mainly in dates, formal enumeration and anywhere a large figure is written out in full. You read it exactly as you read the small ones, by taking each group from the largest value down, "five hundred twenty".
- Chapters and sections: Long documents number their parts in Roman numerals: legal codes, multi-volume sets and numbered sections all reach values like DXX, part 520.
- Dates and credits: Whenever a year or a copyright line is set in Roman numerals, values like DXX appear in full, which is where longer numerals are most commonly seen.
Frequently asked questions
What does DXX mean in Roman numerals?
DXX means 520 in Roman numerals, which is "five hundred twenty" in words.
What is DXX in numbers?
DXX in numbers is 520. Read the letters from the largest value down and add each group together.
Is DXX a valid Roman numeral?
Yes. DXX follows the standard rules and is the correct way to write 520.
Where is DXX used?
Long documents number their parts in Roman numerals: legal codes, multi-volume sets and numbered sections all reach values like DXX, part 520. Whenever a year or a copyright line is set in Roman numerals, values like DXX appear in full, which is where longer numerals are most commonly seen.
What century does the year 520 fall in?
The year 520, written DXX, falls in the 6th century AD.
Nearby numerals
Last updated July 22, 2026. Reviewed for accuracy against the standard rules for Roman numerals.