20557683165788 has 24 divisors (see below), whose sum is σ = 37594444433280. Its totient is φ = 9817706836080.

The previous prime is 20557683165787. The next prime is 20557683165793. The reversal of 20557683165788 is 88756138675502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20557683165787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161624618 + ... + 161751761.

It is an arithmetic number, because the mean of its divisors is an integer number (1566435184720).

Almost surely, 2^{20557683165788} is an apocalyptic number.

It is an amenable number.

20557683165788 is a deficient number, since it is larger than the sum of its proper divisors (17036761267492).

20557683165788 is a wasteful number, since it uses less digits than its factorization.

20557683165788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323377097 (or 323377095 counting only the distinct ones).

The product of its (nonzero) digits is 677376000, while the sum is 71.

The spelling of 20557683165788 in words is "twenty trillion, five hundred fifty-seven billion, six hundred eighty-three million, one hundred sixty-five thousand, seven hundred eighty-eight".