20561641065176 has 64 divisors (see below), whose sum is σ = 39089143296000. Its totient is φ = 10138765880320.

The previous prime is 20561641065139. The next prime is 20561641065179. The reversal of 20561641065176 is 67156014616502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20561641065179) 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 15 ways as a sum of consecutive naturals, for example, 687182696 + ... + 687212616.

It is an arithmetic number, because the mean of its divisors is an integer number (610767864000).

Almost surely, 2^{20561641065176} is an apocalyptic number.

It is an amenable number.

20561641065176 is a deficient number, since it is larger than the sum of its proper divisors (18527502230824).

20561641065176 is a wasteful number, since it uses less digits than its factorization.

20561641065176 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33632 (or 33628 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 20561641065176 in words is "twenty trillion, five hundred sixty-one billion, six hundred forty-one million, sixty-five thousand, one hundred seventy-six".