20833 has 4 divisors (see below), whose sum is σ = 21168. Its totient is φ = 20500.

The previous prime is 20809. The next prime is 20849. The reversal of 20833 is 33802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33802 = 2 ⋅16901.

It is a cyclic number.

It is not a de Polignac number, because 20833 - 2¹³ = 12641 is a prime.

It is a Duffinian number.

20833 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (20873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43 + ... + 208.

It is an arithmetic number, because the mean of its divisors is an integer number (5292).

2²⁰⁸³³ is an apocalyptic number.

It is an amenable number.

20833 is a deficient number, since it is larger than the sum of its proper divisors (335).

20833 is an equidigital number, since it uses as much as digits as its factorization.

20833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20833 is about 144.3364125922. The cubic root of 20833 is about 27.5159136544.

The spelling of 20833 in words is "twenty thousand, eight hundred thirty-three".