2002021020 has 72 divisors (see below), whose sum is σ = 6078539376. Its totient is φ = 533367552.

The previous prime is 2002021019. The next prime is 2002021027. The reversal of 2002021020 is 201202002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 2002020993 and 2002021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002021027) 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 23 ways as a sum of consecutive naturals, for example, 210079 + ... + 219401.

It is an arithmetic number, because the mean of its divisors is an integer number (84424158).

Almost surely, 2^2002021020 is an apocalyptic number.

2002021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2002021020 is an abundant number, since it is smaller than the sum of its proper divisors (4076518356).

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

2002021020 is a wasteful number, since it uses less digits than its factorization.

2002021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10531 (or 10526 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 2002021020 is about 44743.9495351047. The cubic root of 2002021020 is about 1260.3452946325.

Adding to 2002021020 its reverse (201202002), we get a palindrome (2203223022).

The spelling of 2002021020 in words is "two billion, two million, twenty-one thousand, twenty".