204904890 has 192 divisors, whose sum is σ = 591566976. Its totient is φ = 50948352.

The previous prime is 204904883. The next prime is 204904891. The reversal of 204904890 is 98409402.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204904891) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3866104 + ... + 3866156.

It is an arithmetic number, because the mean of its divisors is an integer number (3081078).

Almost surely, 2^204904890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204904890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295783488).

204904890 is an abundant number, since it is smaller than the sum of its proper divisors (386662086).

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

204904890 is a wasteful number, since it uses less digits than its factorization.

204904890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 204904890 is about 14314.4992926752. The cubic root of 204904890 is about 589.5456523120.

The spelling of 204904890 in words is "two hundred four million, nine hundred four thousand, eight hundred ninety".