19709928 has 48 divisors (see below), whose sum is σ = 61008480. Its totient is φ = 5631264.

The previous prime is 19709909. The next prime is 19709939. The reversal of 19709928 is 82990791.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19050 + ... + 20057.

It is an arithmetic number, because the mean of its divisors is an integer number (1271010).

Almost surely, 2^19709928 is an apocalyptic number.

19709928 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19709928 is an abundant number, since it is smaller than the sum of its proper divisors (41298552).

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

19709928 is a wasteful number, since it uses less digits than its factorization.

19709928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39126 (or 39119 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 19709928 is about 4439.5864672287. The cubic root of 19709928 is about 270.1230714650.

The spelling of 19709928 in words is "nineteen million, seven hundred nine thousand, nine hundred twenty-eight".