204989556 has 48 divisors (see below), whose sum is σ = 505128960. Its totient is φ = 64522080.

The previous prime is 204989503. The next prime is 204989563. The reversal of 204989556 is 655989402.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77821 + ... + 80411.

It is an arithmetic number, because the mean of its divisors is an integer number (10523520).

Almost surely, 2^204989556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204989556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252564480).

204989556 is an abundant number, since it is smaller than the sum of its proper divisors (300139404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204989556 is a wasteful number, since it uses less digits than its factorization.

204989556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2964 (or 2962 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 48.

The square root of 204989556 is about 14317.4563383305. The cubic root of 204989556 is about 589.6268405468.

The spelling of 204989556 in words is "two hundred four million, nine hundred eighty-nine thousand, five hundred fifty-six".