20431342423 has 4 divisors (see below), whose sum is σ = 20561478520. Its totient is φ = 20301206328.

The previous prime is 20431342369. The next prime is 20431342429. The reversal of 20431342423 is 32424313402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20431342423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20431342391 and 20431342400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20431342429) 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, 65067813 + ... + 65068126.

It is an arithmetic number, because the mean of its divisors is an integer number (5140369630).

Almost surely, 2^20431342423 is an apocalyptic number.

20431342423 is a deficient number, since it is larger than the sum of its proper divisors (130136097).

20431342423 is a wasteful number, since it uses less digits than its factorization.

20431342423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130136096.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 20431342423 its reverse (32424313402), we get a palindrome (52855655825).

The spelling of 20431342423 in words is "twenty billion, four hundred thirty-one million, three hundred forty-two thousand, four hundred twenty-three".