20725056 has 84 divisors (see below), whose sum is σ = 64824864. Its totient is φ = 6278400.

The previous prime is 20725051. The next prime is 20725123. The reversal of 20725056 is 65052702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725051) by changing a digit.

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, 4701 + ... + 7971.

Almost surely, 2^20725056 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 20725056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32412432).

20725056 is an abundant number, since it is smaller than the sum of its proper divisors (44099808).

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

20725056 is a wasteful number, since it uses less digits than its factorization.

20725056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3300 (or 3287 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 20725056 is about 4552.4780065367. The cubic root of 20725056 is about 274.6830773283.

Adding to 20725056 its reverse (65052702), we get a palindrome (85777758).

The spelling of 20725056 in words is "twenty million, seven hundred twenty-five thousand, fifty-six".