20270557 has 2 divisors, whose sum is σ = 20270558. Its totient is φ = 20270556.

The previous prime is 20270533. The next prime is 20270563. The reversal of 20270557 is 75507202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10666756 + 9603801 = 3266^2 + 3099^2 .

It is a cyclic number.

It is not a de Polignac number, because 20270557 - 2¹⁹ = 19746269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20270527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10135278 + 10135279.

It is an arithmetic number, because the mean of its divisors is an integer number (10135279).

Almost surely, 2^20270557 is an apocalyptic number.

It is an amenable number.

20270557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20270557 is an equidigital number, since it uses as much as digits as its factorization.

20270557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4900, while the sum is 28.

The square root of 20270557 is about 4502.2835317203. The cubic root of 20270557 is about 272.6602911837.

Adding to 20270557 its reverse (75507202), we get a palindrome (95777759).

The spelling of 20270557 in words is "twenty million, two hundred seventy thousand, five hundred fifty-seven".