400220002020 has 48 divisors (see below), whose sum is σ = 1186534597248. Its totient is φ = 100447372800.

The previous prime is 400220002009. The next prime is 400220002043. The reversal of 400220002020 is 20200022004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 400220001987 and 400220002005.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196185256 + ... + 196187295.

It is an arithmetic number, because the mean of its divisors is an integer number (24719470776).

Almost surely, 2^400220002020 is an apocalyptic number.

It is an amenable number.

400220002020 is an abundant number, since it is smaller than the sum of its proper divisors (786314595228).

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

400220002020 is a wasteful number, since it uses less digits than its factorization.

400220002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392372580 (or 392372578 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

Adding to 400220002020 its reverse (20200022004), we get a palindrome (420420024024).

The spelling of 400220002020 in words is "four hundred billion, two hundred twenty million, two thousand, twenty".