19926877878 has 40 divisors (see below), whose sum is σ = 45188961048. Its totient is φ = 6562260576.

The previous prime is 19926877849. The next prime is 19926877939. The reversal of 19926877878 is 87877862991.

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 19 ways as a sum of consecutive naturals, for example, 727551 + ... + 754442.

Almost surely, 2^19926877878 is an apocalyptic number.

19926877878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19926877878 is an abundant number, since it is smaller than the sum of its proper divisors (25262083170).

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

19926877878 is a wasteful number, since it uses less digits than its factorization.

19926877878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1482090 (or 1482081 counting only the distinct ones).

The product of its digits is 170698752, while the sum is 72.

The spelling of 19926877878 in words is "nineteen billion, nine hundred twenty-six million, eight hundred seventy-seven thousand, eight hundred seventy-eight".