19887718032 has 240 divisors, whose sum is σ = 68761987840. Its totient is φ = 5225223168.

The previous prime is 19887718001. The next prime is 19887718087. The reversal of 19887718032 is 23081778891.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19887718032.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3627069 + ... + 3632547.

Almost surely, 2^19887718032 is an apocalyptic number.

19887718032 is a gapful number since it is divisible by the number (12) 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 19887718032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34380993920).

19887718032 is an abundant number, since it is smaller than the sum of its proper divisors (48874269808).

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

19887718032 is a wasteful number, since it uses less digits than its factorization.

19887718032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5790 (or 5781 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 54.

The spelling of 19887718032 in words is "nineteen billion, eight hundred eighty-seven million, seven hundred eighteen thousand, thirty-two".