20557424 has 20 divisors (see below), whose sum is σ = 40678944. Its totient is φ = 10059648.

The previous prime is 20557421. The next prime is 20557447. The reversal of 20557424 is 42475502.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20557421) 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 3 ways as a sum of consecutive naturals, for example, 12917 + ... + 14420.

Almost surely, 2^20557424 is an apocalyptic number.

It is an amenable number.

20557424 is a deficient number, since it is larger than the sum of its proper divisors (20121520).

20557424 is a wasteful number, since it uses less digits than its factorization.

20557424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27392 (or 27386 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 20557424 is about 4534.0295543810. The cubic root of 20557424 is about 273.9404918097.

The spelling of 20557424 in words is "twenty million, five hundred fifty-seven thousand, four hundred twenty-four".