19886134980 has 96 divisors (see below), whose sum is σ = 56286203904. Its totient is φ = 5245599744.

The previous prime is 19886134973. The next prime is 19886135021. The reversal of 19886134980 is 8943168891.

It is a self number, because there is not a number n which added to its sum of digits gives 19886134980.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2686164 + ... + 2693556.

It is an arithmetic number, because the mean of its divisors is an integer number (586314624).

Almost surely, 2^19886134980 is an apocalyptic number.

19886134980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19886134980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28143101952).

19886134980 is an abundant number, since it is smaller than the sum of its proper divisors (36400068924).

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

19886134980 is a wasteful number, since it uses less digits than its factorization.

19886134980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7885 (or 7883 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 57.

The spelling of 19886134980 in words is "nineteen billion, eight hundred eighty-six million, one hundred thirty-four thousand, nine hundred eighty".