20878777698 has 32 divisors (see below), whose sum is σ = 45640143360. Its totient is φ = 6338906880.

The previous prime is 20878777697. The next prime is 20878777709. The reversal of 20878777698 is 89677787802.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20878777691) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3298353 + ... + 3304676.

It is an arithmetic number, because the mean of its divisors is an integer number (1426254480).

Almost surely, 2^20878777698 is an apocalyptic number.

20878777698 is an abundant number, since it is smaller than the sum of its proper divisors (24761365662).

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

20878777698 is a wasteful number, since it uses less digits than its factorization.

20878777698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6603082.

The product of its (nonzero) digits is 132765696, while the sum is 69.

The spelling of 20878777698 in words is "twenty billion, eight hundred seventy-eight million, seven hundred seventy-seven thousand, six hundred ninety-eight".