We would like to show you a description here but the site won’t allow us. In Roman numerals, CCXX represents the number 220 . To convert roman numerals to numbers, we split the roman numeral into single letters, write their numerical value and add/subtract them. Definition of Roman numeral CCXX . What number is Roman CCXX ? The answer is: 220. Roman numerals to decimal number conversion Learn how to write CCXX as a normal number and see the Roman numeral symbols and values. Use the online calculator to convert any Roman numeral to decimal or vice versa.