2821020 has 24 divisors (see below), whose sum is σ = 7899024. Its totient is φ = 752256.

The previous prime is 2821009. The next prime is 2821057. The reversal of 2821020 is 201282.

2821020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×2821020³ = 67350333440535624000, which contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

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, 23449 + ... + 23568.

It is an arithmetic number, because the mean of its divisors is an integer number (329126).

2^2821020 is an apocalyptic number.

2821020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2821020 is an abundant number, since it is smaller than the sum of its proper divisors (5078004).

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

2821020 is a wasteful number, since it uses less digits than its factorization.

2821020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47029 (or 47027 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2821020 is about 1679.5892354978. The cubic root of 2821020 is about 141.2977962351.

The spelling of 2821020 in words is "two million, eight hundred twenty-one thousand, twenty".