204516620 has 72 divisors (see below), whose sum is σ = 539562912. Its totient is φ = 63740160.

The previous prime is 204516619. The next prime is 204516623. The reversal of 204516620 is 26615402.

It is a self number, because there is not a number n which added to its sum of digits gives 204516620.

It is not an unprimeable number, because it can be changed into a prime (204516623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10904 + ... + 22976.

Almost surely, 2^204516620 is an apocalyptic number.

204516620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204516620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269781456).

204516620 is an abundant number, since it is smaller than the sum of its proper divisors (335046292).

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

204516620 is a wasteful number, since it uses less digits than its factorization.

204516620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12111 (or 12098 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 204516620 is about 14300.9307389414. The cubic root of 204516620 is about 589.1730442792.

The spelling of 204516620 in words is "two hundred four million, five hundred sixteen thousand, six hundred twenty".