20433 has 12 divisors (see below), whose sum is σ = 31920. Its totient is φ = 11592.

The previous prime is 20431. The next prime is 20441. The reversal of 20433 is 33402.

It is not a de Polignac number, because 20433 - 2¹ = 20431 is a prime.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78 + ... + 216.

It is an arithmetic number, because the mean of its divisors is an integer number (2660).

2²⁰⁴³³ is an apocalyptic number.

It is an amenable number.

20433 is a deficient number, since it is larger than the sum of its proper divisors (11487).

20433 is a wasteful number, since it uses less digits than its factorization.

20433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 12.

The square root of 20433 is about 142.9440449966. The cubic root of 20433 is about 27.3386697228.

Adding to 20433 its reverse (33402), we get a palindrome (53835).

The spelling of 20433 in words is "twenty thousand, four hundred thirty-three".