19964664 has 64 divisors (see below), whose sum is σ = 58730400. Its totient is φ = 6262272.

The previous prime is 19964653. The next prime is 19964669. The reversal of 19964664 is 46646991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19964669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 954 + ... + 6390.

Almost surely, 2^19964664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19964664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29365200).

19964664 is an abundant number, since it is smaller than the sum of its proper divisors (38765736).

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

19964664 is a wasteful number, since it uses less digits than its factorization.

19964664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5469 (or 5459 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 19964664 is about 4468.1835235362. The cubic root of 19964664 is about 271.2818063179.

The spelling of 19964664 in words is "nineteen million, nine hundred sixty-four thousand, six hundred sixty-four".