2021020020 has 36 divisors (see below), whose sum is σ = 6130427940. Its totient is φ = 538938624.

The previous prime is 2021020007. The next prime is 2021020021. The reversal of 2021020020 is 200201202.

It can be written as a sum of positive squares in 2 ways, for example, as 1278348516 + 742671504 = 35754^2 + 27252^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 = 2021019984 and 2021020011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021020021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5613765 + ... + 5614124.

It is an arithmetic number, because the mean of its divisors is an integer number (170289665).

Almost surely, 2^2021020020 is an apocalyptic number.

2021020020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2021020020 is an abundant number, since it is smaller than the sum of its proper divisors (4109407920).

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

2021020020 is a wasteful number, since it uses less digits than its factorization.

2021020020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11227904 (or 11227899 counting only the distinct ones).

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

The square root of 2021020020 is about 44955.7562498953. The cubic root of 2021020020 is about 1264.3196036934.

Adding to 2021020020 its reverse (200201202), we get a palindrome (2221221222).

The spelling of 2021020020 in words is "two billion, twenty-one million, twenty thousand, twenty".