20536510560657 has 32 divisors (see below), whose sum is σ = 33741889671168. Its totient is φ = 10819282867776.

The previous prime is 20536510560647. The next prime is 20536510560659. The reversal of 20536510560657 is 75606501563502.

It is not a de Polignac number, because 20536510560657 - 2⁴ = 20536510560641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20536510560659) 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 31 ways as a sum of consecutive naturals, for example, 45477213 + ... + 45926570.

It is an arithmetic number, because the mean of its divisors is an integer number (1054434052224).

Almost surely, 2^{20536510560657} is an apocalyptic number.

It is an amenable number.

20536510560657 is a deficient number, since it is larger than the sum of its proper divisors (13205379110511).

20536510560657 is a wasteful number, since it uses less digits than its factorization.

20536510560657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91404629.

The product of its (nonzero) digits is 5670000, while the sum is 51.

The spelling of 20536510560657 in words is "twenty trillion, five hundred thirty-six billion, five hundred ten million, five hundred sixty thousand, six hundred fifty-seven".