20859606 has 64 divisors (see below), whose sum is σ = 49593600. Its totient is φ = 6561000.

The previous prime is 20859589. The next prime is 20859617. The reversal of 20859606 is 60695802.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82981 + ... + 83231.

It is an arithmetic number, because the mean of its divisors is an integer number (774900).

Almost surely, 2^20859606 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20859606, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24796800).

20859606 is an abundant number, since it is smaller than the sum of its proper divisors (28733994).

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

20859606 is an equidigital number, since it uses as much as digits as its factorization.

20859606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 275 counting only the distinct ones).

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

The square root of 20859606 is about 4567.2317655227. The cubic root of 20859606 is about 275.2762227317.

The spelling of 20859606 in words is "twenty million, eight hundred fifty-nine thousand, six hundred six".