20404242423 has 12 divisors (see below), whose sum is σ = 29758939600. Its totient is φ = 13470761376.

The previous prime is 20404242413. The next prime is 20404242427. The reversal of 20404242423 is 32424240402.

It is not a de Polignac number, because 20404242423 - 2¹³ = 20404234231 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 (20404242427) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11004598 + ... + 11006451.

Almost surely, 2^20404242423 is an apocalyptic number.

20404242423 is a deficient number, since it is larger than the sum of its proper divisors (9354697177).

20404242423 is a wasteful number, since it uses less digits than its factorization.

20404242423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22011158 (or 22011155 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 27.

Adding to 20404242423 its reverse (32424240402), we get a palindrome (52828482825).

The spelling of 20404242423 in words is "twenty billion, four hundred four million, two hundred forty-two thousand, four hundred twenty-three".