20868788683 has 4 divisors (see below), whose sum is σ = 20870856688. Its totient is φ = 20866720680.

The previous prime is 20868788663. The next prime is 20868788701. The reversal of 20868788683 is 38688786802.

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-20868788683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20868788623) 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, 1018791 + ... + 1039072.

It is an arithmetic number, because the mean of its divisors is an integer number (5217714172).

Almost surely, 2^20868788683 is an apocalyptic number.

20868788683 is a deficient number, since it is larger than the sum of its proper divisors (2068005).

20868788683 is a wasteful number, since it uses less digits than its factorization.

20868788683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2068004.

The product of its (nonzero) digits is 49545216, while the sum is 64.

The spelling of 20868788683 in words is "twenty billion, eight hundred sixty-eight million, seven hundred eighty-eight thousand, six hundred eighty-three".