19885864032 has 144 divisors (see below), whose sum is σ = 59841669888. Its totient is φ = 6250970880.

The previous prime is 19885864013. The next prime is 19885864073. The reversal of 19885864032 is 23046858891.

19885864032 is a `hidden beast` number, since 19 + 8 + 8 + 586 + 40 + 3 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 19885864032.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 449163 + ... + 491445.

It is an arithmetic number, because the mean of its divisors is an integer number (415567152).

Almost surely, 2^19885864032 is an apocalyptic number.

19885864032 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 19885864032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29920834944).

19885864032 is an abundant number, since it is smaller than the sum of its proper divisors (39955805856).

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

19885864032 is a wasteful number, since it uses less digits than its factorization.

19885864032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42393 (or 42382 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 54.

The spelling of 19885864032 in words is "nineteen billion, eight hundred eighty-five million, eight hundred sixty-four thousand, thirty-two".