20135566773 has 24 divisors (see below), whose sum is σ = 33268367808. Its totient is φ = 11496102912.

The previous prime is 20135566739. The next prime is 20135566777. The reversal of 20135566773 is 37766553102.

20135566773 is a `hidden beast` number, since 2 + 0 + 13 + 5 + 566 + 7 + 73 = 666.

It is not a de Polignac number, because 20135566773 - 2¹⁴ = 20135550389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20135566777) 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 23 ways as a sum of consecutive naturals, for example, 64140 + ... + 210677.

It is an arithmetic number, because the mean of its divisors is an integer number (1386181992).

Almost surely, 2^20135566773 is an apocalyptic number.

It is an amenable number.

20135566773 is a deficient number, since it is larger than the sum of its proper divisors (13132801035).

20135566773 is a wasteful number, since it uses less digits than its factorization.

20135566773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275993 (or 275990 counting only the distinct ones).

The product of its (nonzero) digits is 793800, while the sum is 45.

The spelling of 20135566773 in words is "twenty billion, one hundred thirty-five million, five hundred sixty-six thousand, seven hundred seventy-three".