20733 has 4 divisors (see below), whose sum is σ = 27648. Its totient is φ = 13820.

The previous prime is 20731. The next prime is 20743. The reversal of 20733 is 33702.

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.

It is a cyclic number.

It is not a de Polignac number, because 20733 - 2¹ = 20731 is a prime.

It is a D-number.

It is a Curzon number.

20733 is a lucky number.

It is a plaindrome in base 14.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731) 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, 3453 + ... + 3458.

It is an arithmetic number, because the mean of its divisors is an integer number (6912).

2²⁰⁷³³ is an apocalyptic number.

It is an amenable number.

20733 is a deficient number, since it is larger than the sum of its proper divisors (6915).

20733 is an equidigital number, since it uses as much as digits as its factorization.

20733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6914.

The product of its (nonzero) digits is 126, while the sum is 15.

The square root of 20733 is about 143.9895829565. The cubic root of 20733 is about 27.4718168566.

The spelling of 20733 in words is "twenty thousand, seven hundred thirty-three".