20626656 has 96 divisors (see below), whose sum is σ = 58060800. Its totient is φ = 6397440.

The previous prime is 20626643. The next prime is 20626657. The reversal of 20626656 is 65662602.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20626657) 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 15 ways as a sum of consecutive naturals, for example, 86185 + ... + 86423.

It is an arithmetic number, because the mean of its divisors is an integer number (604800).

Almost surely, 2^20626656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20626656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29030400).

20626656 is an abundant number, since it is smaller than the sum of its proper divisors (37434144).

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

20626656 is a wasteful number, since it uses less digits than its factorization.

20626656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312 (or 304 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 20626656 is about 4541.6578470862. The cubic root of 20626656 is about 274.2476670936.

It can be divided in two parts, 206 and 26656, that added together give a palindrome (26862).

The spelling of 20626656 in words is "twenty million, six hundred twenty-six thousand, six hundred fifty-six".