20669206 has 8 divisors (see below), whose sum is σ = 31023504. Its totient is φ = 10328040.

The previous prime is 20669191. The next prime is 20669213. The reversal of 20669206 is 60296602.

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

It is a congruent number.

It is an unprimeable number.

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, 3271 + ... + 7213.

It is an arithmetic number, because the mean of its divisors is an integer number (3877938).

Almost surely, 2^20669206 is an apocalyptic number.

20669206 is a deficient number, since it is larger than the sum of its proper divisors (10354298).

20669206 is a wasteful number, since it uses less digits than its factorization.

20669206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6566.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20669206 is about 4546.3398465139. The cubic root of 20669206 is about 274.4361161794.

The spelling of 20669206 in words is "twenty million, six hundred sixty-nine thousand, two hundred six".