20772527761 has 4 divisors (see below), whose sum is σ = 20772816052. Its totient is φ = 20772239472.

The previous prime is 20772527747. The next prime is 20772527767. The reversal of 20772527761 is 16772527702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 15479092225 + 5293435536 = 124415^2 + 72756^2 .

It is a cyclic number.

It is not a de Polignac number, because 20772527761 - 2⁵ = 20772527729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20772527767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68635 + ... + 215071.

It is an arithmetic number, because the mean of its divisors is an integer number (5193204013).

Almost surely, 2^20772527761 is an apocalyptic number.

It is an amenable number.

20772527761 is a deficient number, since it is larger than the sum of its proper divisors (288291).

20772527761 is a wasteful number, since it uses less digits than its factorization.

20772527761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288290.

The product of its (nonzero) digits is 576240, while the sum is 46.

The spelling of 20772527761 in words is "twenty billion, seven hundred seventy-two million, five hundred twenty-seven thousand, seven hundred sixty-one".