20404342423 has 4 divisors (see below), whose sum is σ = 20595037320. Its totient is φ = 20213647528.

The previous prime is 20404342411. The next prime is 20404342477. The reversal of 20404342423 is 32424340402.

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 20404342423 - 2⁵ = 20404342391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20404342391 and 20404342400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404342403) 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, 95347288 + ... + 95347501.

It is an arithmetic number, because the mean of its divisors is an integer number (5148759330).

Almost surely, 2^20404342423 is an apocalyptic number.

20404342423 is a deficient number, since it is larger than the sum of its proper divisors (190694897).

20404342423 is a wasteful number, since it uses less digits than its factorization.

20404342423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190694896.

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 20404342423 its reverse (32424340402), we get a palindrome (52828682825).

The spelling of 20404342423 in words is "twenty billion, four hundred four million, three hundred forty-two thousand, four hundred twenty-three".