16640204 has 36 divisors (see below), whose sum is σ = 34368264. Its totient is φ = 7027776.

The previous prime is 16640191. The next prime is 16640207. The reversal of 16640204 is 40204661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 16640204.

It is not an unprimeable number, because it can be changed into a prime (16640207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13727 + ... + 14889.

It is an arithmetic number, because the mean of its divisors is an integer number (954674).

Almost surely, 2^16640204 is an apocalyptic number.

16640204 is a gapful number since it is divisible by the number (14) 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 16640204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17184132).

16640204 is an abundant number, since it is smaller than the sum of its proper divisors (17728060).

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

16640204 is a wasteful number, since it uses less digits than its factorization.

16640204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1245 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 16640204 is about 4079.2406156048. The cubic root of 16640204 is about 255.3012152441.

Adding to 16640204 its reverse (40204661), we get a palindrome (56844865).

The spelling of 16640204 in words is "sixteen million, six hundred forty thousand, two hundred four".