20002020 has 24 divisors (see below), whose sum is σ = 56005824. Its totient is φ = 5333856.

The previous prime is 20002007. The next prime is 20002027. The reversal of 20002020 is 2020002.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

20002020 is a modest number, since divided by 2020 gives 2000 as remainder.

It is not an unprimeable number, because it can be changed into a prime (20002027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166624 + ... + 166743.

It is an arithmetic number, because the mean of its divisors is an integer number (2333576).

Almost surely, 2^20002020 is an apocalyptic number.

20002020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20002020 is an abundant number, since it is smaller than the sum of its proper divisors (36003804).

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

20002020 is a wasteful number, since it uses less digits than its factorization.

20002020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333379 (or 333377 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 6.

The square root of 20002020 is about 4472.3617921631. The cubic root of 20002020 is about 271.4508998912.

Adding to 20002020 its reverse (2020002), we get a palindrome (22022022).

The spelling of 20002020 in words is "twenty million, two thousand, twenty".