20403043 has 4 divisors (see below), whose sum is σ = 21603240. Its totient is φ = 19202848.

The previous prime is 20403023. The next prime is 20403073. The reversal of 20403043 is 34030402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20403043 - 2⁵ = 20403011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20403013) 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, 600073 + ... + 600106.

It is an arithmetic number, because the mean of its divisors is an integer number (5400810).

Almost surely, 2^20403043 is an apocalyptic number.

20403043 is a deficient number, since it is larger than the sum of its proper divisors (1200197).

20403043 is a wasteful number, since it uses less digits than its factorization.

20403043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200196.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20403043 is about 4516.9727694552. The cubic root of 20403043 is about 273.2530270062.

Adding to 20403043 its reverse (34030402), we get a palindrome (54433445).

The spelling of 20403043 in words is "twenty million, four hundred three thousand, forty-three".