20387055771 has 6 divisors (see below), whose sum is σ = 29447969460. Its totient is φ = 13591370508.

The previous prime is 20387055761. The next prime is 20387055847. The reversal of 20387055771 is 17755078302.

20387055771 is a `hidden beast` number, since 2 + 0 + 3 + 8 + 70 + 5 + 577 + 1 = 666.

It is not a de Polignac number, because 20387055771 - 2⁵ = 20387055739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20387055751) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1132614201 + ... + 1132614218.

It is an arithmetic number, because the mean of its divisors is an integer number (4907994910).

Almost surely, 2^20387055771 is an apocalyptic number.

20387055771 is a deficient number, since it is larger than the sum of its proper divisors (9060913689).

20387055771 is a wasteful number, since it uses less digits than its factorization.

20387055771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265228425 (or 2265228422 counting only the distinct ones).

The product of its (nonzero) digits is 411600, while the sum is 45.

The spelling of 20387055771 in words is "twenty billion, three hundred eighty-seven million, fifty-five thousand, seven hundred seventy-one".