20806646 has 8 divisors (see below), whose sum is σ = 35668560. Its totient is φ = 8917128.

The previous prime is 20806637. The next prime is 20806661. The reversal of 20806646 is 64660802.

It is a happy number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743081 + ... + 743108.

It is an arithmetic number, because the mean of its divisors is an integer number (4458570).

Almost surely, 2^20806646 is an apocalyptic number.

20806646 is a deficient number, since it is larger than the sum of its proper divisors (14861914).

20806646 is a wasteful number, since it uses less digits than its factorization.

20806646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486198.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 20806646 is about 4561.4302581537. The cubic root of 20806646 is about 275.0430610255.

The spelling of 20806646 in words is "twenty million, eight hundred six thousand, six hundred forty-six".