20799 has 6 divisors (see below), whose sum is σ = 30056. Its totient is φ = 13860.

The previous prime is 20789. The next prime is 20807. The reversal of 20799 is 99702.

It is not a de Polignac number, because 20799 - 2⁸ = 20543 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20719) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1147 + ... + 1164.

2²⁰⁷⁹⁹ is an apocalyptic number.

20799 is a deficient number, since it is larger than the sum of its proper divisors (9257).

20799 is a wasteful number, since it uses less digits than its factorization.

20799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317 (or 2314 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 20799 is about 144.2185841007. The cubic root of 20799 is about 27.5009366072.

The spelling of 20799 in words is "twenty thousand, seven hundred ninety-nine".