20605

20605 is a five-digit integer. It lies between 20604 and 20606.

In mathematics, 20605 is an odd composite number. Its prime factorization is 5 × 13 × 317, so its positive divisors are 1, 5, 13, 65, 317, 1585, 4121, and 20605. The sum of its digits is 13, which means the number is not divisible by 3. It is congruent to 1 modulo 4 and to 4 modulo 9.

In postal usage, 20605 is used as a ZIP code in the United States for mail delivery. ZIP codes are assigned by the United States Postal Service to geographic areas, and a single ZIP code can cover part of a town or multiple nearby communities, depending on local routing. The specific city or counties associated with a given ZIP code can change over time as boundaries are adjusted to reflect population and logistics needs.

Beyond its numerical properties and postal use, 20605 does not denote a widely recognized year, organization, or product in common reference sources.