20786656 has 24 divisors (see below), whose sum is σ = 44644824. Its totient is φ = 9448320.

The previous prime is 20786651. The next prime is 20786669. The reversal of 20786656 is 65668702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20786651) 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, 29175 + ... + 29878.

It is an arithmetic number, because the mean of its divisors is an integer number (1860201).

Almost surely, 2^20786656 is an apocalyptic number.

It is an amenable number.

20786656 is an abundant number, since it is smaller than the sum of its proper divisors (23858168).

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

20786656 is a wasteful number, since it uses less digits than its factorization.

20786656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59074 (or 59066 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 20786656 is about 4559.2385329131. The cubic root of 20786656 is about 274.9549501962.

The spelling of 20786656 in words is "twenty million, seven hundred eighty-six thousand, six hundred fifty-six".