4004040020420 has 96 divisors (see below), whose sum is σ = 9775367110656. Its totient is φ = 1363077372800.

The previous prime is 4004040020401. The next prime is 4004040020423. The reversal of 4004040020420 is 240200404004.

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 = 4004040020392 and 4004040020401.

It is not an unprimeable number, because it can be changed into a prime (4004040020423) 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, 8180396 + ... + 8656035.

It is an arithmetic number, because the mean of its divisors is an integer number (101826740736).

Almost surely, 2^{4004040020420} is an apocalyptic number.

It is an amenable number.

4004040020420 is an abundant number, since it is smaller than the sum of its proper divisors (5771327090236).

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

4004040020420 is a wasteful number, since it uses less digits than its factorization.

4004040020420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16836521 (or 16836519 counting only the distinct ones).

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

Adding to 4004040020420 its reverse (240200404004), we get a palindrome (4244240424424).

The spelling of 4004040020420 in words is "four trillion, four billion, forty million, twenty thousand, four hundred twenty".