204640512 has 144 divisors (see below), whose sum is σ = 572091072. Its totient is φ = 64880640.

The previous prime is 204640511. The next prime is 204640523. The reversal of 204640512 is 215046402.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (204640511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2109648 + ... + 2109744.

Almost surely, 2^204640512 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 204640512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (286045536).

204640512 is an abundant number, since it is smaller than the sum of its proper divisors (367450560).

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

204640512 is an equidigital number, since it uses as much as digits as its factorization.

204640512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 204640512 is about 14305.2616893226. The cubic root of 204640512 is about 589.2919899382.

Adding to 204640512 its reverse (215046402), we get a palindrome (419686914).

The spelling of 204640512 in words is "two hundred four million, six hundred forty thousand, five hundred twelve".