204989557 has 8 divisors (see below), whose sum is σ = 211414016. Its totient is φ = 198640512.

The previous prime is 204989503. The next prime is 204989563. The reversal of 204989557 is 755989402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204989557 - 2¹¹ = 204987509 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 204989557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204989357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13308 + ... + 24229.

It is an arithmetic number, because the mean of its divisors is an integer number (26426752).

Almost surely, 2^204989557 is an apocalyptic number.

It is an amenable number.

204989557 is a deficient number, since it is larger than the sum of its proper divisors (6424459).

204989557 is a wasteful number, since it uses less digits than its factorization.

204989557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37707.

The product of its (nonzero) digits is 907200, while the sum is 49.

The square root of 204989557 is about 14317.4563732529. The cubic root of 204989557 is about 589.6268415056.

The spelling of 204989557 in words is "two hundred four million, nine hundred eighty-nine thousand, five hundred fifty-seven".