204157 has 4 divisors (see below), whose sum is σ = 206140. Its totient is φ = 202176.

The previous prime is 204151. The next prime is 204161. The reversal of 204157 is 751402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60516 + 143641 = 246^2 + 379^2 .

It is a cyclic number.

It is not a de Polignac number, because 204157 - 2¹¹ = 202109 is a prime.

It is a Duffinian number.

204157 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828 + ... + 1045.

It is an arithmetic number, because the mean of its divisors is an integer number (51535).

2²⁰⁴¹⁵⁷ is an apocalyptic number.

It is an amenable number.

204157 is a deficient number, since it is larger than the sum of its proper divisors (1983).

204157 is a wasteful number, since it uses less digits than its factorization.

204157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 204157 is about 451.8373601198. The cubic root of 204157 is about 58.8827509656.

Adding to 204157 its reverse (751402), we get a palindrome (955559).

It can be divided in two parts, 204 and 157, that added together give a square (361 = 19²).

The spelling of 204157 in words is "two hundred four thousand, one hundred fifty-seven".