20542866768 has 60 divisors (see below), whose sum is σ = 57628224628. Its totient is φ = 6831336960.

The previous prime is 20542866661. The next prime is 20542866769. The reversal of 20542866768 is 86766824502.

20542866768 is a `hidden beast` number, since 20 + 542 + 8 + 6 + 6 + 76 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9708555024 + 10834311744 = 98532^2 + 104088^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542866769) 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, 108805 + ... + 230052.

Almost surely, 2^20542866768 is an apocalyptic number.

It is an amenable number.

20542866768 is an abundant number, since it is smaller than the sum of its proper divisors (37085357860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20542866768 is a wasteful number, since it uses less digits than its factorization.

20542866768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339292 (or 339283 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 54.

The spelling of 20542866768 in words is "twenty billion, five hundred forty-two million, eight hundred sixty-six thousand, seven hundred sixty-eight".