20546378865 has 64 divisors (see below), whose sum is σ = 37896192000. Its totient is φ = 10550865600.

The previous prime is 20546378861. The next prime is 20546378873. The reversal of 20546378865 is 56887364502.

20546378865 is a `hidden beast` number, since 2 + 0 + 546 + 37 + 8 + 8 + 65 = 666.

It is not a de Polignac number, because 20546378865 - 2² = 20546378861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20546378861) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 820480 + ... + 845150.

It is an arithmetic number, because the mean of its divisors is an integer number (592128000).

Almost surely, 2^20546378865 is an apocalyptic number.

It is an amenable number.

20546378865 is a deficient number, since it is larger than the sum of its proper divisors (17349813135).

20546378865 is a wasteful number, since it uses less digits than its factorization.

20546378865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24915 (or 24909 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 20546378865 in words is "twenty billion, five hundred forty-six million, three hundred seventy-eight thousand, eight hundred sixty-five".