20565600170056 has 16 divisors (see below), whose sum is σ = 38564086502700. Its totient is φ = 10281843769344.

The previous prime is 20565600170039. The next prime is 20565600170077. The reversal of 20565600170056 is 65007100656502.

It can be written as a sum of positive squares in 2 ways, for example, as 16908823617156 + 3656776552900 = 4112034^2 + 1912270^2 .

It is a super-2 number, since 2×20565600170056² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20565600169994 and 20565600170021.

It is an unprimeable number.

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, 119448061 + ... + 119620108.

Almost surely, 2^{20565600170056} is an apocalyptic number.

It is an amenable number.

20565600170056 is a deficient number, since it is larger than the sum of its proper divisors (17998486332644).

20565600170056 is a wasteful number, since it uses less digits than its factorization.

20565600170056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239078928 (or 239078924 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 43.

The spelling of 20565600170056 in words is "twenty trillion, five hundred sixty-five billion, six hundred million, one hundred seventy thousand, fifty-six".