204100434 has 48 divisors (see below), whose sum is σ = 463993920. Its totient is φ = 64750560.

The previous prime is 204100427. The next prime is 204100439. The reversal of 204100434 is 434001402.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (204100439) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34309 + ... + 39815.

It is an arithmetic number, because the mean of its divisors is an integer number (9666540).

Almost surely, 2^204100434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 204100434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231996960).

204100434 is an abundant number, since it is smaller than the sum of its proper divisors (259893486).

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

204100434 is a wasteful number, since it uses less digits than its factorization.

204100434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5615 (or 5612 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 204100434 is about 14286.3723177019. The cubic root of 204100434 is about 588.7731222747.

Adding to 204100434 its reverse (434001402), we get a palindrome (638101836).

The spelling of 204100434 in words is "two hundred four million, one hundred thousand, four hundred thirty-four".