205530057 has 6 divisors (see below), whose sum is σ = 296876762. Its totient is φ = 137020032.

The previous prime is 205530043. The next prime is 205530077. The reversal of 205530057 is 750035502.

It can be written as a sum of positive squares in only one way, i.e., 197796096 + 7733961 = 14064^2 + 2781^2 .

It is not a de Polignac number, because 205530057 - 2¹¹ = 205528009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205530057.

It is not an unprimeable number, because it can be changed into a prime (205530037) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11418328 + ... + 11418345.

Almost surely, 2^205530057 is an apocalyptic number.

It is an amenable number.

205530057 is a deficient number, since it is larger than the sum of its proper divisors (91346705).

205530057 is a wasteful number, since it uses less digits than its factorization.

205530057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22836679 (or 22836676 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 27.

The square root of 205530057 is about 14336.3195067632. The cubic root of 205530057 is about 590.1446135984.

Adding to 205530057 its reverse (750035502), we get a palindrome (955565559).

Subtracting 205530057 from its reverse (750035502), we obtain a palindrome (544505445).

The spelling of 205530057 in words is "two hundred five million, five hundred thirty thousand, fifty-seven".