20633 has 4 divisors (see below), whose sum is σ = 21120. Its totient is φ = 20148.

The previous prime is 20627. The next prime is 20639. The reversal of 20633 is 33602.

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 an interprime number because it is at equal distance from previous prime (20627) and next prime (20639).

It is a cyclic number.

It is not a de Polignac number, because 20633 - 2¹⁰ = 19609 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (20639) 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, 173 + ... + 266.

It is an arithmetic number, because the mean of its divisors is an integer number (5280).

2²⁰⁶³³ is an apocalyptic number.

It is an amenable number.

20633 is a deficient number, since it is larger than the sum of its proper divisors (487).

20633 is an equidigital number, since it uses as much as digits as its factorization.

20633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 20633 is about 143.6419158881. The cubic root of 20633 is about 27.4275780374.

The spelling of 20633 in words is "twenty thousand, six hundred thirty-three".