20525800077 has 12 divisors (see below), whose sum is σ = 29673497724. Its totient is φ = 13672272960.

The previous prime is 20525800069. The next prime is 20525800079. The reversal of 20525800077 is 77000852502.

20525800077 is a `hidden beast` number, since 2 + 0 + 5 + 2 + 580 + 0 + 0 + 77 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14079958281 + 6445841796 = 118659^2 + 80286^2 .

It is not a de Polignac number, because 20525800077 - 2³ = 20525800069 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20525800079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 954928 + ... + 976185.

It is an arithmetic number, because the mean of its divisors is an integer number (2472791477).

Almost surely, 2^20525800077 is an apocalyptic number.

It is an amenable number.

20525800077 is a deficient number, since it is larger than the sum of its proper divisors (9147697647).

20525800077 is a wasteful number, since it uses less digits than its factorization.

20525800077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932300 (or 1932297 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The spelling of 20525800077 in words is "twenty billion, five hundred twenty-five million, eight hundred thousand, seventy-seven".