400020442220 has 48 divisors (see below), whose sum is σ = 1001790332928. Its totient is φ = 131186827200.

The previous prime is 400020442207. The next prime is 400020442277. The reversal of 400020442220 is 22244020004.

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 = 400020442192 and 400020442201.

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, 62111756 + ... + 62118195.

It is an arithmetic number, because the mean of its divisors is an integer number (20870631936).

Almost surely, 2^400020442220 is an apocalyptic number.

It is an amenable number.

400020442220 is an abundant number, since it is smaller than the sum of its proper divisors (601769890708).

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

400020442220 is a wasteful number, since it uses less digits than its factorization.

400020442220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124229990 (or 124229988 counting only the distinct ones).

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

Adding to 400020442220 its reverse (22244020004), we get a palindrome (422264462224).

The spelling of 400020442220 in words is "four hundred billion, twenty million, four hundred forty-two thousand, two hundred twenty".