204642434 has 16 divisors (see below), whose sum is σ = 317892600. Its totient is φ = 98741760.

The previous prime is 204642419. The next prime is 204642437. The reversal of 204642434 is 434246402.

It can be written as a sum of positive squares in 4 ways, for example, as 178089025 + 26553409 = 13345^2 + 5153^2 .

It is a junction number, because it is equal to n+sod(n) for n = 204642397 and 204642406.

It is not an unprimeable number, because it can be changed into a prime (204642437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9359 + ... + 22290.

Almost surely, 2^204642434 is an apocalyptic number.

204642434 is a deficient number, since it is larger than the sum of its proper divisors (113250166).

204642434 is a wasteful number, since it uses less digits than its factorization.

204642434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31765.

The product of its (nonzero) digits is 18432, while the sum is 29.

The square root of 204642434 is about 14305.3288672438. The cubic root of 204642434 is about 589.2938348248.

Adding to 204642434 its reverse (434246402), we get a palindrome (638888836).

The spelling of 204642434 in words is "two hundred four million, six hundred forty-two thousand, four hundred thirty-four".