19841891680 has 96 divisors (see below), whose sum is σ = 50954720544. Its totient is φ = 7257686016.

The previous prime is 19841891639. The next prime is 19841891681. The reversal of 19841891680 is 8619814891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19841891681) 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, 177984 + ... + 267136.

It is an arithmetic number, because the mean of its divisors is an integer number (530778339).

Almost surely, 2^19841891680 is an apocalyptic number.

19841891680 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 19841891680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25477360272).

19841891680 is an abundant number, since it is smaller than the sum of its proper divisors (31112828864).

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

19841891680 is a wasteful number, since it uses less digits than its factorization.

19841891680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89288 (or 89280 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 55.

The spelling of 19841891680 in words is "nineteen billion, eight hundred forty-one million, eight hundred ninety-one thousand, six hundred eighty".