400022020 has 24 divisors (see below), whose sum is σ = 840942144. Its totient is φ = 159838176.

The previous prime is 400022017. The next prime is 400022057. The reversal of 400022020 is 20220004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 400021988 and 400022006.

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, 9487 + ... + 29833.

It is an arithmetic number, because the mean of its divisors is an integer number (35039256).

Almost surely, 2^400022020 is an apocalyptic number.

It is an amenable number.

400022020 is an abundant number, since it is smaller than the sum of its proper divisors (440920124).

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

400022020 is a wasteful number, since it uses less digits than its factorization.

400022020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21339 (or 21337 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 400022020 is about 20000.5504924240. The cubic root of 400022020 is about 736.8198198756.

Adding to 400022020 its reverse (20220004), we get a palindrome (420242024).

The spelling of 400022020 in words is "four hundred million, twenty-two thousand, twenty".