204404004020 has 48 divisors (see below), whose sum is σ = 433595223936. Its totient is φ = 80934000000.

The previous prime is 204404004011. The next prime is 204404004023. The reversal of 204404004020 is 20400404402.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 204404003983 and 204404004001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204404004023) 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, 12416795 + ... + 12433245.

It is an arithmetic number, because the mean of its divisors is an integer number (9033233832).

Almost surely, 2^204404004020 is an apocalyptic number.

204404004020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204404004020 is an abundant number, since it is smaller than the sum of its proper divisors (229191219916).

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

204404004020 is a wasteful number, since it uses less digits than its factorization.

204404004020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22712 (or 22710 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 204404004020 its reverse (20400404402), we get a palindrome (224804408422).

The spelling of 204404004020 in words is "two hundred four billion, four hundred four million, four thousand, twenty".