4002020 has 24 divisors (see below), whose sum is σ = 9168768. Its totient is φ = 1455200.

The previous prime is 4002017. The next prime is 4002041. The reversal of 4002020 is 202004.

4002020 is a modest number, since divided by 2020 gives 400 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 4001989 and 4002007.

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, 8876 + ... + 9315.

It is an arithmetic number, because the mean of its divisors is an integer number (382032).

Almost surely, 2^4002020 is an apocalyptic number.

It is an amenable number.

4002020 is an abundant number, since it is smaller than the sum of its proper divisors (5166748).

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

4002020 is a wasteful number, since it uses less digits than its factorization.

4002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18211 (or 18209 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 4002020 is about 2000.5049362598. The cubic root of 4002020 is about 158.7668219510.

Subtracting from 4002020 its product of nonzero digits (16), we obtain a palindrome (4002004).

Adding to 4002020 its reverse (202004), we get a palindrome (4204024).

The spelling of 4002020 in words is "four million, two thousand, twenty".