20190557 has 2 divisors, whose sum is σ = 20190558. Its totient is φ = 20190556.

The previous prime is 20190551. The next prime is 20190563. The reversal of 20190557 is 75509102.

It is a balanced prime because it is at equal distance from previous prime (20190551) and next prime (20190563).

It can be written as a sum of positive squares in only one way, i.e., 18567481 + 1623076 = 4309^2 + 1274^2 .

It is a cyclic number.

It is not a de Polignac number, because 20190557 - 2⁸ = 20190301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20190551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10095278 + 10095279.

It is an arithmetic number, because the mean of its divisors is an integer number (10095279).

Almost surely, 2^20190557 is an apocalyptic number.

It is an amenable number.

20190557 is a deficient number, since it is larger than the sum of its proper divisors (1).

20190557 is an equidigital number, since it uses as much as digits as its factorization.

20190557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 20190557 is about 4493.3903680851. The cubic root of 20190557 is about 272.3011235833.

Adding to 20190557 its reverse (75509102), we get a palindrome (95699659).

The spelling of 20190557 in words is "twenty million, one hundred ninety thousand, five hundred fifty-seven".