20768816 has 20 divisors (see below), whose sum is σ = 41989872. Its totient is φ = 9932736.

The previous prime is 20768801. The next prime is 20768819. The reversal of 20768816 is 61886702.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20768816.

It is not an unprimeable number, because it can be changed into a prime (20768819) 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 3 ways as a sum of consecutive naturals, for example, 27851 + ... + 28586.

Almost surely, 2^20768816 is an apocalyptic number.

It is an amenable number.

20768816 is an abundant number, since it is smaller than the sum of its proper divisors (21221056).

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

20768816 is a wasteful number, since it uses less digits than its factorization.

20768816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56468 (or 56462 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 20768816 is about 4557.2816458937. The cubic root of 20768816 is about 274.8762683043.

The spelling of 20768816 in words is "twenty million, seven hundred sixty-eight thousand, eight hundred sixteen".