204400004420 has 48 divisors (see below), whose sum is σ = 434903249088. Its totient is φ = 80686569600.

The previous prime is 204400004383. The next prime is 204400004429. The reversal of 204400004420 is 24400004402.

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 = 204400004392 and 204400004401.

It is not an unprimeable number, because it can be changed into a prime (204400004429) 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, 455339 + ... + 784941.

It is an arithmetic number, because the mean of its divisors is an integer number (9060484356).

Almost surely, 2^204400004420 is an apocalyptic number.

204400004420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

204400004420 is an abundant number, since it is smaller than the sum of its proper divisors (230503244668).

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

204400004420 is a wasteful number, since it uses less digits than its factorization.

204400004420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330020 (or 330018 counting only the distinct ones).

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

Adding to 204400004420 its reverse (24400004402), we get a palindrome (228800008822).

The spelling of 204400004420 in words is "two hundred four billion, four hundred million, four thousand, four hundred twenty".