404240400020 has 48 divisors (see below), whose sum is σ = 898908917760. Its totient is φ = 152173023744.

The previous prime is 404240399971. The next prime is 404240400059. The reversal of 404240400020 is 20004042404.

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 = 404240399965 and 404240400001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5375117 + ... + 5449803.

It is an arithmetic number, because the mean of its divisors is an integer number (18727269120).

Almost surely, 2^404240400020 is an apocalyptic number.

It is an amenable number.

404240400020 is an abundant number, since it is smaller than the sum of its proper divisors (494668517740).

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

404240400020 is a wasteful number, since it uses less digits than its factorization.

404240400020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90632 (or 90630 counting only the distinct ones).

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

Adding to 404240400020 its reverse (20004042404), we get a palindrome (424244442424).

The spelling of 404240400020 in words is "four hundred four billion, two hundred forty million, four hundred thousand, twenty".