20557450 has 24 divisors (see below), whose sum is σ = 38387052. Its totient is φ = 8190720.

The previous prime is 20557447. The next prime is 20557451. The reversal of 20557450 is 5475502.

It can be written as a sum of positive squares in 6 ways, for example, as 9247681 + 11309769 = 3041^2 + 3363^2 .

It is not an unprimeable number, because it can be changed into a prime (20557451) 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, 15202 + ... + 16498.

Almost surely, 2^20557450 is an apocalyptic number.

20557450 is a deficient number, since it is larger than the sum of its proper divisors (17829602).

20557450 is a wasteful number, since it uses less digits than its factorization.

20557450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626 (or 1621 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 28.

The square root of 20557450 is about 4534.0324215868. The cubic root of 20557450 is about 273.9406072984.

The spelling of 20557450 in words is "twenty million, five hundred fifty-seven thousand, four hundred fifty".