19986194980 has 24 divisors (see below), whose sum is σ = 41975330040. Its totient is φ = 7993655040.

The previous prime is 19986194971. The next prime is 19986195029. The reversal of 19986194980 is 8949168991.

It can be written as a sum of positive squares in 4 ways, for example, as 995150116 + 18991044864 = 31546^2 + 137808^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171216 + ... + 263224.

It is an arithmetic number, because the mean of its divisors is an integer number (1748972085).

Almost surely, 2^19986194980 is an apocalyptic number.

19986194980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19986194980 is an abundant number, since it is smaller than the sum of its proper divisors (21989135060).

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

19986194980 is a wasteful number, since it uses less digits than its factorization.

19986194980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102879 (or 102877 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 64.

The spelling of 19986194980 in words is "nineteen billion, nine hundred eighty-six million, one hundred ninety-four thousand, nine hundred eighty".