20788564 has 12 divisors (see below), whose sum is σ = 36553888. Its totient is φ = 10344600.

The previous prime is 20788553. The next prime is 20788567. The reversal of 20788564 is 46588702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20788567) 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 3 ways as a sum of consecutive naturals, for example, 11472 + ... + 13159.

Almost surely, 2^20788564 is an apocalyptic number.

It is an amenable number.

20788564 is a deficient number, since it is larger than the sum of its proper divisors (15765324).

20788564 is a wasteful number, since it uses less digits than its factorization.

20788564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24846 (or 24844 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 20788564 is about 4559.4477735796. The cubic root of 20788564 is about 274.9633626122.

The spelling of 20788564 in words is "twenty million, seven hundred eighty-eight thousand, five hundred sixty-four".