20085612557 has 32 divisors (see below), whose sum is σ = 22804254720. Its totient is φ = 17576248320.

The previous prime is 20085612529. The next prime is 20085612563. The reversal of 20085612557 is 75521658002.

It is a de Polignac number, because none of the positive numbers 2^k-20085612557 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 (20085612517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12077108 + ... + 12078770.

It is an arithmetic number, because the mean of its divisors is an integer number (712632960).

Almost surely, 2^20085612557 is an apocalyptic number.

It is an amenable number.

20085612557 is a deficient number, since it is larger than the sum of its proper divisors (2718642163).

20085612557 is a wasteful number, since it uses less digits than its factorization.

20085612557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373.

The product of its (nonzero) digits is 168000, while the sum is 41.

The spelling of 20085612557 in words is "twenty billion, eighty-five million, six hundred twelve thousand, five hundred fifty-seven".