20423504078 has 4 divisors (see below), whose sum is σ = 30635256120. Its totient is φ = 10211752038.

The previous prime is 20423504039. The next prime is 20423504093. The reversal of 20423504078 is 87040532402.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105876018 + ... + 5105876021.

It is an arithmetic number, because the mean of its divisors is an integer number (7658814030).

Almost surely, 2^20423504078 is an apocalyptic number.

20423504078 is a deficient number, since it is larger than the sum of its proper divisors (10211752042).

20423504078 is a wasteful number, since it uses less digits than its factorization.

20423504078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10211752041.

The product of its (nonzero) digits is 53760, while the sum is 35.

The spelling of 20423504078 in words is "twenty billion, four hundred twenty-three million, five hundred four thousand, seventy-eight".