2180520 has 80 divisors (see below), whose sum is σ = 7339860. Its totient is φ = 580608.

The previous prime is 2180501. The next prime is 2180527. The reversal of 2180520 is 250812.

It can be written as a sum of positive squares in 2 ways, for example, as 2125764 + 54756 = 1458^2 + 234^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2180493 and 2180502.

It is not an unprimeable number, because it can be changed into a prime (2180527) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2904 + ... + 3576.

2^2180520 is an apocalyptic number.

2180520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2180520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3669930).

2180520 is an abundant number, since it is smaller than the sum of its proper divisors (5159340).

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

2180520 is a wasteful number, since it uses less digits than its factorization.

2180520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 2180520 is about 1476.6583897435. The cubic root of 2180520 is about 129.6741345398.

The spelling of 2180520 in words is "two million, one hundred eighty thousand, five hundred twenty".