400402420020 has 96 divisors (see below), whose sum is σ = 1311259420800. Its totient is φ = 101154292992.

The previous prime is 400402419997. The next prime is 400402420021. The reversal of 400402420020 is 20024204004.

400402420020 is a `hidden beast` number, since 40 + 0 + 402 + 4 + 200 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 400402419975 and 400402420002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400402420021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19502529 + ... + 19523048.

It is an arithmetic number, because the mean of its divisors is an integer number (13658952300).

Almost surely, 2^400402420020 is an apocalyptic number.

It is an amenable number.

400402420020 is an abundant number, since it is smaller than the sum of its proper divisors (910857000780).

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

400402420020 is a wasteful number, since it uses less digits than its factorization.

400402420020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39025614 (or 39025606 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

Adding to 400402420020 its reverse (20024204004), we get a palindrome (420426624024).

The spelling of 400402420020 in words is "four hundred billion, four hundred two million, four hundred twenty thousand, twenty".