20665364 has 12 divisors (see below), whose sum is σ = 36206688. Its totient is φ = 10320600.

The previous prime is 20665363. The next prime is 20665367. The reversal of 20665364 is 46356602.

It is a self number, because there is not a number n which added to its sum of digits gives 20665364.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20665361) 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, 1619 + ... + 6629.

It is an arithmetic number, because the mean of its divisors is an integer number (3017224).

Almost surely, 2^20665364 is an apocalyptic number.

It is an amenable number.

20665364 is a deficient number, since it is larger than the sum of its proper divisors (15541324).

20665364 is a wasteful number, since it uses less digits than its factorization.

20665364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6046 (or 6044 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 20665364 is about 4545.9172891728. The cubic root of 20665364 is about 274.4191110286.

The spelling of 20665364 in words is "twenty million, six hundred sixty-five thousand, three hundred sixty-four".