19680891 has 8 divisors (see below), whose sum is σ = 26375184. Its totient is φ = 13053600.

The previous prime is 19680889. The next prime is 19680907. The reversal of 19680891 is 19808691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19680891 - 2¹ = 19680889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19680841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16060 + ... + 17241.

It is an arithmetic number, because the mean of its divisors is an integer number (3296898).

Almost surely, 2^19680891 is an apocalyptic number.

19680891 is a deficient number, since it is larger than the sum of its proper divisors (6694293).

19680891 is a wasteful number, since it uses less digits than its factorization.

19680891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33501.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 19680891 is about 4436.3150248827. The cubic root of 19680891 is about 269.9903563085.

The spelling of 19680891 in words is "nineteen million, six hundred eighty thousand, eight hundred ninety-one".