20042367839 has 4 divisors (see below), whose sum is σ = 21584088456. Its totient is φ = 18500647224.

The previous prime is 20042367809. The next prime is 20042367871. The reversal of 20042367839 is 93876324002.

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-20042367839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20042367839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20042367809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770860289 + ... + 770860314.

It is an arithmetic number, because the mean of its divisors is an integer number (5396022114).

Almost surely, 2^20042367839 is an apocalyptic number.

20042367839 is a deficient number, since it is larger than the sum of its proper divisors (1541720617).

20042367839 is a wasteful number, since it uses less digits than its factorization.

20042367839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1541720616.

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 20042367839 in words is "twenty billion, forty-two million, three hundred sixty-seven thousand, eight hundred thirty-nine".