19993928 has 32 divisors (see below), whose sum is σ = 39720000. Its totient is φ = 9408960.

The previous prime is 19993927. The next prime is 19993943. The reversal of 19993928 is 82939991.

It is not an unprimeable number, because it can be changed into a prime (19993927) 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, 29918 + ... + 30578.

It is an arithmetic number, because the mean of its divisors is an integer number (1241250).

Almost surely, 2^19993928 is an apocalyptic number.

It is an amenable number.

19993928 is a deficient number, since it is larger than the sum of its proper divisors (19726072).

19993928 is a wasteful number, since it uses less digits than its factorization.

19993928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885 (or 881 counting only the distinct ones).

The product of its digits is 314928, while the sum is 50.

The square root of 19993928 is about 4471.4570332275. The cubic root of 19993928 is about 271.4142889728.

The spelling of 19993928 in words is "nineteen million, nine hundred ninety-three thousand, nine hundred twenty-eight".