204520245 has 16 divisors (see below), whose sum is σ = 328211520. Its totient is φ = 108751104.

The previous prime is 204520241. The next prime is 204520271. The reversal of 204520245 is 542025402.

It is a happy number.

204520245 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 204520245 - 2² = 204520241 is a prime.

It is a super-2 number, since 2×204520245² = 83657061229720050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204520241) 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, 15175 + ... + 25284.

It is an arithmetic number, because the mean of its divisors is an integer number (20513220).

Almost surely, 2^204520245 is an apocalyptic number.

It is an amenable number.

204520245 is a deficient number, since it is larger than the sum of its proper divisors (123691275).

204520245 is a wasteful number, since it uses less digits than its factorization.

204520245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40804.

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 204520245 is about 14301.0574783825. The cubic root of 204520245 is about 589.1765252346.

Adding to 204520245 its reverse (542025402), we get a palindrome (746545647).

The spelling of 204520245 in words is "two hundred four million, five hundred twenty thousand, two hundred forty-five".