20557572 has 24 divisors (see below), whose sum is σ = 54820416. Its totient is φ = 5873568.

The previous prime is 20557571. The next prime is 20557583. The reversal of 20557572 is 27575502.

It is a super-2 number, since 2×20557572² = 845227533070368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20557571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122283 + ... + 122450.

It is an arithmetic number, because the mean of its divisors is an integer number (2284184).

Almost surely, 2^20557572 is an apocalyptic number.

It is an amenable number.

20557572 is an abundant number, since it is smaller than the sum of its proper divisors (34262844).

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

20557572 is a wasteful number, since it uses less digits than its factorization.

20557572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244747 (or 244745 counting only the distinct ones).

The product of its (nonzero) digits is 24500, while the sum is 33.

The square root of 20557572 is about 4534.0458753744. The cubic root of 20557572 is about 273.9411492056.

The spelling of 20557572 in words is "twenty million, five hundred fifty-seven thousand, five hundred seventy-two".