20666204 has 12 divisors (see below), whose sum is σ = 38947944. Its totient is φ = 9538224.

The previous prime is 20666201. The next prime is 20666209. The reversal of 20666204 is 40266602.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20666201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198662 + ... + 198765.

It is an arithmetic number, because the mean of its divisors is an integer number (3245662).

Almost surely, 2^20666204 is an apocalyptic number.

It is an amenable number.

20666204 is a deficient number, since it is larger than the sum of its proper divisors (18281740).

20666204 is a wasteful number, since it uses less digits than its factorization.

20666204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397444 (or 397442 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20666204 is about 4546.0096788282. The cubic root of 20666204 is about 274.4228291489.

The spelling of 20666204 in words is "twenty million, six hundred sixty-six thousand, two hundred four".