23420543 has 4 divisors (see below), whose sum is σ = 24798240. Its totient is φ = 22042848.

The previous prime is 23420533. The next prime is 23420563. The reversal of 23420543 is 34502432.

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 23420543 - 2⁶ = 23420479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23420533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688823 + ... + 688856.

It is an arithmetic number, because the mean of its divisors is an integer number (6199560).

Almost surely, 2^23420543 is an apocalyptic number.

23420543 is a deficient number, since it is larger than the sum of its proper divisors (1377697).

23420543 is a wasteful number, since it uses less digits than its factorization.

23420543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1377696.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 23420543 is about 4839.4775544474. The cubic root of 23420543 is about 286.1095273848.

Adding to 23420543 its reverse (34502432), we get a palindrome (57922975).

The spelling of 23420543 in words is "twenty-three million, four hundred twenty thousand, five hundred forty-three".