20321071423 has 4 divisors (see below), whose sum is σ = 20976589888. Its totient is φ = 19665552960.

The previous prime is 20321071403. The next prime is 20321071447. The reversal of 20321071423 is 32417012302.

It is a happy number.

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 20321071423 - 2²¹ = 20318974271 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 (20321071403) 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, 327759186 + ... + 327759247.

It is an arithmetic number, because the mean of its divisors is an integer number (5244147472).

Almost surely, 2^20321071423 is an apocalyptic number.

20321071423 is a deficient number, since it is larger than the sum of its proper divisors (655518465).

20321071423 is an equidigital number, since it uses as much as digits as its factorization.

20321071423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655518464.

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 20321071423 its reverse (32417012302), we get a palindrome (52738083725).

The spelling of 20321071423 in words is "twenty billion, three hundred twenty-one million, seventy-one thousand, four hundred twenty-three".