20787878873 has 8 divisors (see below), whose sum is σ = 20839291200. Its totient is φ = 20736507568.

The previous prime is 20787878869. The next prime is 20787878899. The reversal of 20787878873 is 37887878702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20787878873 - 2² = 20787878869 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20787878173) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1167683 + ... + 1185351.

It is an arithmetic number, because the mean of its divisors is an integer number (2604911400).

Almost surely, 2^20787878873 is an apocalyptic number.

It is an amenable number.

20787878873 is a deficient number, since it is larger than the sum of its proper divisors (51412327).

20787878873 is a wasteful number, since it uses less digits than its factorization.

20787878873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20511.

The product of its (nonzero) digits is 59006976, while the sum is 65.

The spelling of 20787878873 in words is "twenty billion, seven hundred eighty-seven million, eight hundred seventy-eight thousand, eight hundred seventy-three".