2820820 has 12 divisors (see below), whose sum is σ = 5923764. Its totient is φ = 1128320.

The previous prime is 2820817. The next prime is 2820821. The reversal of 2820820 is 280282.

It can be written as a sum of positive squares in 2 ways, for example, as 318096 + 2502724 = 564^2 + 1582^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2820791 and 2820800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2820821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70501 + ... + 70540.

It is an arithmetic number, because the mean of its divisors is an integer number (493647).

2^2820820 is an apocalyptic number.

2820820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2820820 is an abundant number, since it is smaller than the sum of its proper divisors (3102944).

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

2820820 is a wasteful number, since it uses less digits than its factorization.

2820820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141050 (or 141048 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 2820820 is about 1679.5296960757. The cubic root of 2820820 is about 141.2944569906.

The spelling of 2820820 in words is "two million, eight hundred twenty thousand, eight hundred twenty".