404400020 has 24 divisors (see below), whose sum is σ = 850264800. Its totient is φ = 161564832.

The previous prime is 404400011. The next prime is 404400023. The reversal of 404400020 is 20004404.

It is a junction number, because it is equal to n+sod(n) for n = 404399968 and 404400004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404400023) 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 7 ways as a sum of consecutive naturals, for example, 5411 + ... + 28949.

It is an arithmetic number, because the mean of its divisors is an integer number (35427700).

Almost surely, 2^404400020 is an apocalyptic number.

It is an amenable number.

404400020 is an abundant number, since it is smaller than the sum of its proper divisors (445864780).

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

404400020 is a wasteful number, since it uses less digits than its factorization.

404400020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24407 (or 24405 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 404400020 is about 20109.6996496715. The cubic root of 404400020 is about 739.4980891626.

Adding to 404400020 its reverse (20004404), we get a palindrome (424404424).

The spelling of 404400020 in words is "four hundred four million, four hundred thousand, twenty".