20594557 has 2 divisors, whose sum is σ = 20594558. Its totient is φ = 20594556.

The previous prime is 20594551. The next prime is 20594573. The reversal of 20594557 is 75549502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20304036 + 290521 = 4506^2 + 539^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20594557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20594551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10297278 + 10297279.

It is an arithmetic number, because the mean of its divisors is an integer number (10297279).

Almost surely, 2^20594557 is an apocalyptic number.

It is an amenable number.

20594557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20594557 is an equidigital number, since it uses as much as digits as its factorization.

20594557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 20594557 is about 4538.1226294581. The cubic root of 20594557 is about 274.1053327240.

The spelling of 20594557 in words is "twenty million, five hundred ninety-four thousand, five hundred fifty-seven".