204400025 has 12 divisors (see below), whose sum is σ = 260307372. Its totient is φ = 159099840.

The previous prime is 204399997. The next prime is 204400037. The reversal of 204400025 is 520004402.

It can be written as a sum of positive squares in 6 ways, for example, as 795664 + 203604361 = 892^2 + 14269^2 .

It is not a de Polignac number, because 204400025 - 2¹⁰ = 204399001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204399976 and 204400012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109562 + ... + 111411.

It is an arithmetic number, because the mean of its divisors is an integer number (21692281).

Almost surely, 2^204400025 is an apocalyptic number.

204400025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

204400025 is a deficient number, since it is larger than the sum of its proper divisors (55907347).

204400025 is a wasteful number, since it uses less digits than its factorization.

204400025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221020 (or 221015 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 17.

The square root of 204400025 is about 14296.8536748475. The cubic root of 204400025 is about 589.0610604064.

Adding to 204400025 its reverse (520004402), we get a palindrome (724404427).

The spelling of 204400025 in words is "two hundred four million, four hundred thousand, twenty-five".