19928664 has 48 divisors (see below), whose sum is σ = 61685520. Its totient is φ = 5693760.

The previous prime is 19928653. The next prime is 19928677. The reversal of 19928664 is 46682991.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 19267 + ... + 20274.

It is an arithmetic number, because the mean of its divisors is an integer number (1285115).

Almost surely, 2^19928664 is an apocalyptic number.

19928664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19928664 is an abundant number, since it is smaller than the sum of its proper divisors (41756856).

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

19928664 is a wasteful number, since it uses less digits than its factorization.

19928664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39560 (or 39553 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 19928664 is about 4464.1532231768. The cubic root of 19928664 is about 271.1186510390.

The spelling of 19928664 in words is "nineteen million, nine hundred twenty-eight thousand, six hundred sixty-four".