20557712 has 60 divisors (see below), whose sum is σ = 47282688. Its totient is φ = 8481600.

The previous prime is 20557711. The next prime is 20557721. The reversal of 20557712 is 21775502.

It is not an unprimeable number, because it can be changed into a prime (20557711) 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 11 ways as a sum of consecutive naturals, for example, 107537 + ... + 107727.

Almost surely, 2^20557712 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 20557712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23641344).

20557712 is an abundant number, since it is smaller than the sum of its proper divisors (26724976).

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

20557712 is a wasteful number, since it uses less digits than its factorization.

20557712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 231 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 29.

The square root of 20557712 is about 4534.0613140980. The cubic root of 20557712 is about 273.9417710636.

The spelling of 20557712 in words is "twenty million, five hundred fifty-seven thousand, seven hundred twelve".