19928428 has 24 divisors (see below), whose sum is σ = 37784880. Its totient is φ = 9142080.

The previous prime is 19928401. The next prime is 19928453. The reversal of 19928428 is 82482991.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8238 + ... + 10378.

It is an arithmetic number, because the mean of its divisors is an integer number (1574370).

Almost surely, 2^19928428 is an apocalyptic number.

It is an amenable number.

19928428 is a deficient number, since it is larger than the sum of its proper divisors (17856452).

19928428 is a wasteful number, since it uses less digits than its factorization.

19928428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337 (or 2335 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 19928428 is about 4464.1267903141. The cubic root of 19928428 is about 271.1175808175.

The spelling of 19928428 in words is "nineteen million, nine hundred twenty-eight thousand, four hundred twenty-eight".