19928656 has 40 divisors (see below), whose sum is σ = 42408000. Its totient is φ = 8997120.

The previous prime is 19928653. The next prime is 19928677. The reversal of 19928656 is 65682991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19928653) 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, 34740 + ... + 35308.

It is an arithmetic number, because the mean of its divisors is an integer number (1060200).

Almost surely, 2^19928656 is an apocalyptic number.

19928656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19928656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21204000).

19928656 is an abundant number, since it is smaller than the sum of its proper divisors (22479344).

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

19928656 is a wasteful number, since it uses less digits than its factorization.

19928656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 781 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 19928656 is about 4464.1523271501. The cubic root of 19928656 is about 271.1186147604.

It can be divided in two parts, 1992 and 8656, that added together give a cube (10648 = 22³).

The spelling of 19928656 in words is "nineteen million, nine hundred twenty-eight thousand, six hundred fifty-six".