400242020020 has 24 divisors (see below), whose sum is σ = 858391398144. Its totient is φ = 156690492576.

The previous prime is 400242019999. The next prime is 400242020023. The reversal of 400242020020 is 20020242004.

It is a junction number, because it is equal to n+sod(n) for n = 400242019976 and 400242020003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400242020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212893752 + ... + 212895631.

It is an arithmetic number, because the mean of its divisors is an integer number (35766308256).

Almost surely, 2^400242020020 is an apocalyptic number.

It is an amenable number.

400242020020 is an abundant number, since it is smaller than the sum of its proper divisors (458149378124).

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

400242020020 is a wasteful number, since it uses less digits than its factorization.

400242020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425789439 (or 425789437 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

Adding to 400242020020 its reverse (20020242004), we get a palindrome (420262262024).

The spelling of 400242020020 in words is "four hundred billion, two hundred forty-two million, twenty thousand, twenty".