2152820 has 12 divisors (see below), whose sum is σ = 4520964. Its totient is φ = 861120.

The previous prime is 2152819. The next prime is 2152831. The reversal of 2152820 is 282512.

It can be written as a sum of positive squares in 2 ways, for example, as 605284 + 1547536 = 778^2 + 1244^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 107641 = 2152820 / (2 + 1 + 5 + 2 + 8 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 2152792 and 2152801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53801 + ... + 53840.

It is an arithmetic number, because the mean of its divisors is an integer number (376747).

2^2152820 is an apocalyptic number.

2152820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2152820 is an abundant number, since it is smaller than the sum of its proper divisors (2368144).

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

2152820 is a wasteful number, since it uses less digits than its factorization.

2152820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107650 (or 107648 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 2152820 is about 1467.2491267675. The cubic root of 2152820 is about 129.1226923958.

The spelling of 2152820 in words is "two million, one hundred fifty-two thousand, eight hundred twenty".