20685606 has 8 divisors (see below), whose sum is σ = 41371224. Its totient is φ = 6895200.

The previous prime is 20685601. The next prime is 20685629. The reversal of 20685606 is 60658602.

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

20685606 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20685601) by changing a digit.

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, 1723795 + ... + 1723806.

It is an arithmetic number, because the mean of its divisors is an integer number (5171403).

Almost surely, 2^20685606 is an apocalyptic number.

20685606 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20685606 is a wasteful number, since it uses less digits than its factorization.

20685606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447606.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 20685606 is about 4548.1431375892. The cubic root of 20685606 is about 274.5086808513.

The spelling of 20685606 in words is "twenty million, six hundred eighty-five thousand, six hundred six".