20043 has 12 divisors (see below), whose sum is σ = 30888. Its totient is φ = 12480.

The previous prime is 20029. The next prime is 20047. The reversal of 20043 is 34002.

20043 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 20043 - 2⁵ = 20011 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

20043 is a Rhonda number in base 16.

20043 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20043.

It is not an unprimeable number, because it can be changed into a prime (20047) 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, 88 + ... + 218.

It is an arithmetic number, because the mean of its divisors is an integer number (2574).

2²⁰⁰⁴³ is an apocalyptic number.

20043 is a deficient number, since it is larger than the sum of its proper divisors (10845).

20043 is a wasteful number, since it uses less digits than its factorization.

20043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 20043 is about 141.5733025680. The cubic root of 20043 is about 27.1636155673.

Adding to 20043 its reverse (34002), we get a palindrome (54045).

It can be divided in two parts, 200 and 43, that added together give a 5-th power (243 = 3⁵).

The spelling of 20043 in words is "twenty thousand, forty-three", and thus it is an iban number.