20136618878 has 16 divisors (see below), whose sum is σ = 30737777616. Its totient is φ = 9892033920.

The previous prime is 20136618851. The next prime is 20136618889. The reversal of 20136618878 is 87881663102.

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 7 ways as a sum of consecutive naturals, for example, 305051 + ... + 365142.

It is an arithmetic number, because the mean of its divisors is an integer number (1921111101).

Almost surely, 2^20136618878 is an apocalyptic number.

20136618878 is a deficient number, since it is larger than the sum of its proper divisors (10601158738).

20136618878 is a wasteful number, since it uses less digits than its factorization.

20136618878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670459.

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 20136618878 in words is "twenty billion, one hundred thirty-six million, six hundred eighteen thousand, eight hundred seventy-eight".