20908183878 has 24 divisors (see below), whose sum is σ = 45330484368. Its totient is φ = 6964868592.

The previous prime is 20908183847. The next prime is 20908183913. The reversal of 20908183878 is 87838180902.

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 (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 348625 + ... + 404172.

It is an arithmetic number, because the mean of its divisors is an integer number (1888770182).

Almost surely, 2^20908183878 is an apocalyptic number.

20908183878 is an abundant number, since it is smaller than the sum of its proper divisors (24422300490).

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

20908183878 is a wasteful number, since it uses less digits than its factorization.

20908183878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754348 (or 754345 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 54.

The spelling of 20908183878 in words is "twenty billion, nine hundred eight million, one hundred eighty-three thousand, eight hundred seventy-eight".