400004550020 has 24 divisors (see below), whose sum is σ = 840074505984. Its totient is φ = 159989448416.

The previous prime is 400004549993. The next prime is 400004550103. The reversal of 400004550020 is 20055400004.

It is a happy number.

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 = 400004549974 and 400004550001.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505844 + ... + 1027563.

It is an arithmetic number, because the mean of its divisors is an integer number (35003104416).

Almost surely, 2^400004550020 is an apocalyptic number.

It is an amenable number.

400004550020 is an abundant number, since it is smaller than the sum of its proper divisors (440069955964).

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

400004550020 is a wasteful number, since it uses less digits than its factorization.

400004550020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546459 (or 1546457 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

Adding to 400004550020 its reverse (20055400004), we get a palindrome (420059950024).

The spelling of 400004550020 in words is "four hundred billion, four million, five hundred fifty thousand, twenty".