20032431 has 4 divisors (see below), whose sum is σ = 26709912. Its totient is φ = 13354952.

The previous prime is 20032423. The next prime is 20032457. The reversal of 20032431 is 13423002.

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 20032431 - 2³ = 20032423 is a prime.

It is a super-2 number, since 2×20032431² = 802596583539522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20032431.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3338736 + ... + 3338741.

It is an arithmetic number, because the mean of its divisors is an integer number (6677478).

Almost surely, 2^20032431 is an apocalyptic number.

20032431 is a deficient number, since it is larger than the sum of its proper divisors (6677481).

20032431 is an equidigital number, since it uses as much as digits as its factorization.

20032431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6677480.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 20032431 is about 4475.7603823261. The cubic root of 20032431 is about 271.5884012231.

Adding to 20032431 its reverse (13423002), we get a palindrome (33455433).

The spelling of 20032431 in words is "twenty million, thirty-two thousand, four hundred thirty-one".