20424431213 has 4 divisors (see below), whose sum is σ = 20426917248. Its totient is φ = 20421945180.

The previous prime is 20424431177. The next prime is 20424431281. The reversal of 20424431213 is 31213442402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20424431213 - 2¹⁸ = 20424169069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20424431113) 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, 1230653 + ... + 1247138.

It is an arithmetic number, because the mean of its divisors is an integer number (5106729312).

Almost surely, 2^20424431213 is an apocalyptic number.

It is an amenable number.

20424431213 is a deficient number, since it is larger than the sum of its proper divisors (2486035).

20424431213 is an equidigital number, since it uses as much as digits as its factorization.

20424431213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486034.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 20424431213 its reverse (31213442402), we get a palindrome (51637873615).

The spelling of 20424431213 in words is "twenty billion, four hundred twenty-four million, four hundred thirty-one thousand, two hundred thirteen".