20578186878 has 64 divisors (see below), whose sum is σ = 42178931712. Its totient is φ = 6691426560.

The previous prime is 20578186847. The next prime is 20578186903. The reversal of 20578186878 is 87868187502.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20933575 + ... + 20934557.

It is an arithmetic number, because the mean of its divisors is an integer number (659045808).

Almost surely, 2^20578186878 is an apocalyptic number.

20578186878 is an abundant number, since it is smaller than the sum of its proper divisors (21600744834).

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

20578186878 is a wasteful number, since it uses less digits than its factorization.

20578186878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529.

The product of its (nonzero) digits is 12042240, while the sum is 60.

The spelling of 20578186878 in words is "twenty billion, five hundred seventy-eight million, one hundred eighty-six thousand, eight hundred seventy-eight".