20816704 has 84 divisors (see below), whose sum is σ = 47032164. Its totient is φ = 9105408.

The previous prime is 20816701. The next prime is 20816759. The reversal of 20816704 is 40761802.

It can be written as a sum of positive squares in 2 ways, for example, as 15618304 + 5198400 = 3952^2 + 2280^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816701) 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 11 ways as a sum of consecutive naturals, for example, 392742 + ... + 392794.

Almost surely, 2^20816704 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 20816704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23516082).

20816704 is an abundant number, since it is smaller than the sum of its proper divisors (26215460).

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

20816704 is a wasteful number, since it uses less digits than its factorization.

20816704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 91 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 20816704 is about 4562.5326300203. The cubic root of 20816704 is about 275.0873727880.

The spelling of 20816704 in words is "twenty million, eight hundred sixteen thousand, seven hundred four".