204523530 has 64 divisors (see below), whose sum is σ = 503798400. Its totient is φ = 53121024.

The previous prime is 204523507. The next prime is 204523547. The reversal of 204523530 is 35325402.

It is a self number, because there is not a number n which added to its sum of digits gives 204523530.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194446 + ... + 195494.

It is an arithmetic number, because the mean of its divisors is an integer number (7871850).

Almost surely, 2^204523530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204523530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (251899200).

204523530 is an abundant number, since it is smaller than the sum of its proper divisors (299274870).

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

204523530 is a wasteful number, since it uses less digits than its factorization.

204523530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223.

The product of its (nonzero) digits is 3600, while the sum is 24.

The square root of 204523530 is about 14301.1723295680. The cubic root of 204523530 is about 589.1796796648.

Adding to 204523530 its reverse (35325402), we get a palindrome (239848932).

The spelling of 204523530 in words is "two hundred four million, five hundred twenty-three thousand, five hundred thirty".