20684906 has 8 divisors (see below), whose sum is σ = 33848064. Its totient is φ = 9402220.

The previous prime is 20684899. The next prime is 20684929. The reversal of 20684906 is 60948602.

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

It is a Curzon 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, 470090 + ... + 470133.

It is an arithmetic number, because the mean of its divisors is an integer number (4231008).

Almost surely, 2^20684906 is an apocalyptic number.

20684906 is a deficient number, since it is larger than the sum of its proper divisors (13163158).

20684906 is a wasteful number, since it uses less digits than its factorization.

20684906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 940236.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 20684906 is about 4548.0661824560. The cubic root of 20684906 is about 274.5055843624.

The spelling of 20684906 in words is "twenty million, six hundred eighty-four thousand, nine hundred six".