20115685089 has 6 divisors (see below), whose sum is σ = 29055989586. Its totient is φ = 13410456720.

The previous prime is 20115685087. The next prime is 20115685127. The reversal of 20115685089 is 98058651102.

It is a happy number.

20115685089 is a `hidden beast` number, since 2 + 0 + 1 + 1 + 568 + 5 + 0 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19809155025 + 306530064 = 140745^2 + 17508^2 .

It is not a de Polignac number, because 20115685089 - 2¹ = 20115685087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20115685087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117538052 + ... + 1117538069.

It is an arithmetic number, because the mean of its divisors is an integer number (4842664931).

Almost surely, 2^20115685089 is an apocalyptic number.

It is an amenable number.

20115685089 is a deficient number, since it is larger than the sum of its proper divisors (8940304497).

20115685089 is a wasteful number, since it uses less digits than its factorization.

20115685089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235076127 (or 2235076124 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 20115685089 in words is "twenty billion, one hundred fifteen million, six hundred eighty-five thousand, eighty-nine".