21920

21920 is a six-digit number. In Roman numerals, it would be represented as XXI CMXXX. Its prime factorization is 2 x 2 x 2 x 5 x 548. It is an even number. When written out, it is twenty-one thousand nine hundred twenty. In binary, it is 101010111101000. It is a composite number, meaning it has divisors other than 1 and itself. Some of its divisors include 1, 2, 4, 5, 8, 10, 20, and so on. The sum of its digits is 2 + 1 + 9 + 2 + 0 = 14. 21920 is divisible by 10, as its last digit is 0. It is also divisible by 4 because the last two digits, 20, form a number divisible by 4. It is divisible by 5 as its last digit is 0. It is also divisible by 8 because the last three digits, 920, form a number divisible by 8 (920 / 8 = 115).