19804664 has 32 divisors (see below), whose sum is σ = 41126400. Its totient is φ = 8865120.

The previous prime is 19804661. The next prime is 19804693. The reversal of 19804664 is 46640891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19804661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4217 + ... + 7575.

It is an arithmetic number, because the mean of its divisors is an integer number (1285200).

Almost surely, 2^19804664 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 19804664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20563200).

19804664 is an abundant number, since it is smaller than the sum of its proper divisors (21321736).

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

19804664 is a wasteful number, since it uses less digits than its factorization.

19804664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3443 (or 3439 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 19804664 is about 4450.2431394251. The cubic root of 19804664 is about 270.5551631547. Note that the first 3 decimals are identical.

The spelling of 19804664 in words is "nineteen million, eight hundred four thousand, six hundred sixty-four".