20666206 has 8 divisors (see below), whose sum is σ = 33817464. Its totient is φ = 9393720.

The previous prime is 20666201. The next prime is 20666209. The reversal of 20666206 is 60266602.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 469665 + ... + 469708.

It is an arithmetic number, because the mean of its divisors is an integer number (4227183).

Almost surely, 2^20666206 is an apocalyptic number.

20666206 is a deficient number, since it is larger than the sum of its proper divisors (13151258).

20666206 is a wasteful number, since it uses less digits than its factorization.

20666206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939386.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 20666206 is about 4546.0098988014. The cubic root of 20666206 is about 274.4228380015.

The spelling of 20666206 in words is "twenty million, six hundred sixty-six thousand, two hundred six".