20660856 has 32 divisors (see below), whose sum is σ = 52531200. Its totient is φ = 6769760.

The previous prime is 20660851. The next prime is 20660869. The reversal of 20660856 is 65806602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20660851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5880 + ... + 8711.

It is an arithmetic number, because the mean of its divisors is an integer number (1641600).

Almost surely, 2^20660856 is an apocalyptic number.

It is an amenable number.

20660856 is an abundant number, since it is smaller than the sum of its proper divisors (31870344).

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

20660856 is a wasteful number, since it uses less digits than its factorization.

20660856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14659 (or 14655 counting only the distinct ones).

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

The square root of 20660856 is about 4545.4214326067. The cubic root of 20660856 is about 274.3991553947.

The spelling of 20660856 in words is "twenty million, six hundred sixty thousand, eight hundred fifty-six".