19928 has 16 divisors (see below), whose sum is σ = 38880.
Its totient is φ = 9568.
The previous prime is 19927. The next prime is 19937. The reversal of 19928 is 82991.
It is a self number, because there is not a number n which added to its sum of digits gives 19928.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (19927) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 350 + ... + 402.
It is an arithmetic number, because the mean of its divisors is an integer number (2430).
219928 is an apocalyptic number.
It is an amenable number.
19928 is a deficient number, since it is larger than the sum of its proper divisors (18952).
19928 is a wasteful number, since it uses less digits than its factorization.
19928 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 106 (or 102 counting only the distinct ones).
The product of its digits is 1296, while the sum is 29.
The square root of 19928 is about 141.1665682802.
The cubic root of 19928 is about 27.1115639886.
Note that the first 3 decimals are identical.
The spelling of 19928 in words is "nineteen thousand, nine hundred twenty-eight".