20572056 has 80 divisors (see below), whose sum is σ = 58806000. Its totient is φ = 6716736.

The previous prime is 20572043. The next prime is 20572073. The reversal of 20572056 is 65027502.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 34045 + ... + 34643.

It is an arithmetic number, because the mean of its divisors is an integer number (735075).

Almost surely, 2^20572056 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 20572056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29403000).

20572056 is an abundant number, since it is smaller than the sum of its proper divisors (38233944).

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

20572056 is a wasteful number, since it uses less digits than its factorization.

20572056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 657 counting only the distinct ones).

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

The square root of 20572056 is about 4535.6428430819. The cubic root of 20572056 is about 274.0054699034.

Adding to 20572056 its reverse (65027502), we get a palindrome (85599558).

The spelling of 20572056 in words is "twenty million, five hundred seventy-two thousand, fifty-six".