23420431 has 4 divisors (see below), whose sum is σ = 23464264. Its totient is φ = 23376600.

The previous prime is 23420387. The next prime is 23420437. The reversal of 23420431 is 13402432.

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 23420431 - 2⁹ = 23419919 is a prime.

It is a super-2 number, since 2×23420431² = 1097033176451522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23420399 and 23420408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23420437) 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, 21105 + ... + 22186.

It is an arithmetic number, because the mean of its divisors is an integer number (5866066).

Almost surely, 2^23420431 is an apocalyptic number.

23420431 is a deficient number, since it is larger than the sum of its proper divisors (43833).

23420431 is an equidigital number, since it uses as much as digits as its factorization.

23420431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43832.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 23420431 is about 4839.4659829365. The cubic root of 23420431 is about 286.1090713134.

Adding to 23420431 its reverse (13402432), we get a palindrome (36822863).

The spelling of 23420431 in words is "twenty-three million, four hundred twenty thousand, four hundred thirty-one".