20126656 has 84 divisors (see below), whose sum is σ = 46213776. Its totient is φ = 8673280.

The previous prime is 20126597. The next prime is 20126663. The reversal of 20126656 is 65662102.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178056 + ... + 178168.

It is an arithmetic number, because the mean of its divisors is an integer number (550164).

Almost surely, 2^20126656 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 20126656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23106888).

20126656 is an abundant number, since it is smaller than the sum of its proper divisors (26087120).

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

20126656 is a wasteful number, since it uses less digits than its factorization.

20126656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20126656 is about 4486.2741779789. The cubic root of 20126656 is about 272.0135518046.

Adding to 20126656 its reverse (65662102), we get a palindrome (85788758).

It can be divided in two parts, 2012 and 6656, that added together give a palindrome (8668).

The spelling of 20126656 in words is "twenty million, one hundred twenty-six thousand, six hundred fifty-six".