20689158871 has 16 divisors (see below), whose sum is σ = 21296761920. Its totient is φ = 20086721280.

The previous prime is 20689158823. The next prime is 20689158877. The reversal of 20689158871 is 17885198602.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20689158871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689158877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9021601 + ... + 9023893.

It is an arithmetic number, because the mean of its divisors is an integer number (1331047620).

Almost surely, 2^20689158871 is an apocalyptic number.

20689158871 is a deficient number, since it is larger than the sum of its proper divisors (607603049).

20689158871 is a wasteful number, since it uses less digits than its factorization.

20689158871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3306.

The product of its (nonzero) digits is 1935360, while the sum is 55.

The spelling of 20689158871 in words is "twenty billion, six hundred eighty-nine million, one hundred fifty-eight thousand, eight hundred seventy-one".