20845806 has 8 divisors (see below), whose sum is σ = 41691624. Its totient is φ = 6948600.

The previous prime is 20845771. The next prime is 20845823. The reversal of 20845806 is 60854802.

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

20845806 is an admirable number.

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, 1737145 + ... + 1737156.

It is an arithmetic number, because the mean of its divisors is an integer number (5211453).

Almost surely, 2^20845806 is an apocalyptic number.

20845806 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.

20845806 is a wasteful number, since it uses less digits than its factorization.

20845806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3474306.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 20845806 is about 4565.7207536160. The cubic root of 20845806 is about 275.2155049038.

The spelling of 20845806 in words is "twenty million, eight hundred forty-five thousand, eight hundred six".