20599078819 has 4 divisors (see below), whose sum is σ = 22471722360. Its totient is φ = 18726435280.

The previous prime is 20599078751. The next prime is 20599078847. The reversal of 20599078819 is 91887099502.

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-20599078819 is a prime.

It is a super-2 number, since 2×20599078819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20599078889) 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, 936321754 + ... + 936321775.

It is an arithmetic number, because the mean of its divisors is an integer number (5617930590).

Almost surely, 2^20599078819 is an apocalyptic number.

20599078819 is a deficient number, since it is larger than the sum of its proper divisors (1872643541).

20599078819 is a wasteful number, since it uses less digits than its factorization.

20599078819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872643540.

The product of its (nonzero) digits is 3265920, while the sum is 58.

The spelling of 20599078819 in words is "twenty billion, five hundred ninety-nine million, seventy-eight thousand, eight hundred nineteen".