20542530645 has 96 divisors (see below), whose sum is σ = 44478749952. Its totient is φ = 8539001856.

The previous prime is 20542530611. The next prime is 20542530677. The reversal of 20542530645 is 54603524502.

20542530645 is a `hidden beast` number, since 2 + 0 + 5 + 4 + 2 + 5 + 3 + 0 + 645 = 666.

It is not a de Polignac number, because 20542530645 - 2⁶ = 20542530581 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 236929 + ... + 311801.

It is an arithmetic number, because the mean of its divisors is an integer number (463320312).

Almost surely, 2^20542530645 is an apocalyptic number.

It is an amenable number.

20542530645 is an abundant number, since it is smaller than the sum of its proper divisors (23936219307).

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

20542530645 is a wasteful number, since it uses less digits than its factorization.

20542530645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74971 (or 74968 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 36.

The spelling of 20542530645 in words is "twenty billion, five hundred forty-two million, five hundred thirty thousand, six hundred forty-five".