20324431 has 4 divisors (see below), whose sum is σ = 20349112. Its totient is φ = 20299752.

The previous prime is 20324413. The next prime is 20324453. The reversal of 20324431 is 13442302.

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 20324431 - 2⁵ = 20324399 is a prime.

It is a super-2 number, since 2×20324431² = 826164990947522, 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 = 20324399 and 20324408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20324131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11061 + ... + 12766.

It is an arithmetic number, because the mean of its divisors is an integer number (5087278).

Almost surely, 2^20324431 is an apocalyptic number.

20324431 is a deficient number, since it is larger than the sum of its proper divisors (24681).

20324431 is an equidigital number, since it uses as much as digits as its factorization.

20324431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24680.

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

The square root of 20324431 is about 4508.2625256300. The cubic root of 20324431 is about 272.9016314723.

Adding to 20324431 its reverse (13442302), we get a palindrome (33766733).

The spelling of 20324431 in words is "twenty million, three hundred twenty-four thousand, four hundred thirty-one".