20868771599 has 16 divisors (see below), whose sum is σ = 23175140352. Its totient is φ = 18670519008.

The previous prime is 20868771563. The next prime is 20868771607. The reversal of 20868771599 is 99517786802.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20868771599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868771899) 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 15 ways as a sum of consecutive naturals, for example, 102869 + ... + 228734.

It is an arithmetic number, because the mean of its divisors is an integer number (1448446272).

Almost surely, 2^20868771599 is an apocalyptic number.

20868771599 is a deficient number, since it is larger than the sum of its proper divisors (2306368753).

20868771599 is a wasteful number, since it uses less digits than its factorization.

20868771599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331766.

The product of its (nonzero) digits is 15240960, while the sum is 62.

The spelling of 20868771599 in words is "twenty billion, eight hundred sixty-eight million, seven hundred seventy-one thousand, five hundred ninety-nine".