420 in Roman Numerals
420
C (subtracted)DXX
four hundred twenty
How CDXX is formed
| Place | Value | Symbols |
|---|---|---|
| Hundreds | 400 | C (subtracted)D |
| Tens | 20 | XX |
| Total | 420 | CDXX |
CDXX is written one place at a time, from the largest to the smallest: CD (400) + XX (20) = 420.
CD is the only subtraction: the C before the D takes away 100, so CD = 400.
Common mistakes
Wrong: CCCCXX
Why isn't 420 written as CCCCXX?
A symbol can't be repeated four times in a row. 400 is CD (500 − 100), not CCCC, so 420 is CDXX.
Numbers near 420
Properties of 420
- Prime factors
- 2² × 3 × 5 × 7
- Divisors
- 24 divisors1, 2, 3, 4 … 420
- Even or odd
- Even
- Prime number
- No
- Letters in CDXX
- 4
420,000 in Roman numerals
With a bar over it (vinculum), C̅D̅X̅X̅ means 420 × 1,000 = 420,000. How Roman numerals work