19684418808 has 64 divisors (see below), whose sum is σ = 51399048960. Its totient is φ = 6270277376.

The previous prime is 19684418807. The next prime is 19684418879. The reversal of 19684418808 is 80881448691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19684418807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 589291 + ... + 621797.

It is an arithmetic number, because the mean of its divisors is an integer number (803110140).

Almost surely, 2^19684418808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19684418808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25699524480).

19684418808 is an abundant number, since it is smaller than the sum of its proper divisors (31714630152).

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

19684418808 is a wasteful number, since it uses less digits than its factorization.

19684418808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33636 (or 33632 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 57.

The spelling of 19684418808 in words is "nineteen billion, six hundred eighty-four million, four hundred eighteen thousand, eight hundred eight".