204040020 has 48 divisors (see below), whose sum is σ = 573064128. Its totient is φ = 54243840.

The previous prime is 204040009. The next prime is 204040021. The reversal of 204040020 is 20040402.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 204039978 and 204040005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204040021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15175 + ... + 25265.

It is an arithmetic number, because the mean of its divisors is an integer number (11938836).

Almost surely, 2^204040020 is an apocalyptic number.

204040020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204040020 is an abundant number, since it is smaller than the sum of its proper divisors (369024108).

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

204040020 is a wasteful number, since it uses less digits than its factorization.

204040020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10440 (or 10438 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 204040020 is about 14284.2577686067. The cubic root of 204040020 is about 588.7150239994.

Adding to 204040020 its reverse (20040402), we get a palindrome (224080422).

The spelling of 204040020 in words is "two hundred four million, forty thousand, twenty".