20866204 has 12 divisors (see below), whose sum is σ = 36795528. Its totient is φ = 10353200.

The previous prime is 20866201. The next prime is 20866207. The reversal of 20866204 is 40266802.

It is an interprime number because it is at equal distance from previous prime (20866201) and next prime (20866207).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20866201) 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, 19387 + ... + 20434.

It is an arithmetic number, because the mean of its divisors is an integer number (3066294).

Almost surely, 2^20866204 is an apocalyptic number.

It is an amenable number.

20866204 is a deficient number, since it is larger than the sum of its proper divisors (15929324).

20866204 is a wasteful number, since it uses less digits than its factorization.

20866204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39956 (or 39954 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 20866204 is about 4567.9540277897. The cubic root of 20866204 is about 275.3052434309.

The spelling of 20866204 in words is "twenty million, eight hundred sixty-six thousand, two hundred four".