20568906 has 48 divisors (see below), whose sum is σ = 47361600. Its totient is φ = 6433344.

The previous prime is 20568901. The next prime is 20568907. The reversal of 20568906 is 60986502.

20568906 is a `hidden beast` number, since 2 + 0 + 568 + 90 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20568901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46635 + ... + 47073.

It is an arithmetic number, because the mean of its divisors is an integer number (986700).

Almost surely, 2^20568906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20568906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23680800).

20568906 is an abundant number, since it is smaller than the sum of its proper divisors (26792694).

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

20568906 is a wasteful number, since it uses less digits than its factorization.

20568906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 20568906 is about 4535.2955802241. The cubic root of 20568906 is about 273.9914839202.

The spelling of 20568906 in words is "twenty million, five hundred sixty-eight thousand, nine hundred six".