20555765771 has 8 divisors (see below), whose sum is σ = 21694747200. Its totient is φ = 19422494280.

The previous prime is 20555765759. The next prime is 20555765803. The reversal of 20555765771 is 17756755502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20555765771 - 2²⁶ = 20488656907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20555765171) 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 7 ways as a sum of consecutive naturals, for example, 1420085 + ... + 1434486.

It is an arithmetic number, because the mean of its divisors is an integer number (2711843400).

Almost surely, 2^20555765771 is an apocalyptic number.

20555765771 is a deficient number, since it is larger than the sum of its proper divisors (1138981429).

20555765771 is a wasteful number, since it uses less digits than its factorization.

20555765771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854969.

The product of its (nonzero) digits is 2572500, while the sum is 50.

The spelling of 20555765771 in words is "twenty billion, five hundred fifty-five million, seven hundred sixty-five thousand, seven hundred seventy-one".