19640056 has 32 divisors (see below), whose sum is σ = 37699200. Its totient is φ = 9590400.

The previous prime is 19640029. The next prime is 19640057. The reversal of 19640056 is 65004691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19640057) 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, 87961 + ... + 88183.

It is an arithmetic number, because the mean of its divisors is an integer number (1178100).

Almost surely, 2^19640056 is an apocalyptic number.

It is an amenable number.

19640056 is a deficient number, since it is larger than the sum of its proper divisors (18059144).

19640056 is a wasteful number, since it uses less digits than its factorization.

19640056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 435 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 19640056 is about 4431.7102793391. The cubic root of 19640056 is about 269.8034967106.

The spelling of 19640056 in words is "nineteen million, six hundred forty thousand, fifty-six".