2180720 has 20 divisors (see below), whose sum is σ = 5070360. Its totient is φ = 872256.

The previous prime is 2180719. The next prime is 2180723. The reversal of 2180720 is 270812.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2180692 and 2180701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180723) 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, 13550 + ... + 13709.

It is an arithmetic number, because the mean of its divisors is an integer number (253518).

2^2180720 is an apocalyptic number.

2180720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2180720 is an abundant number, since it is smaller than the sum of its proper divisors (2889640).

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

2180720 is a wasteful number, since it uses less digits than its factorization.

2180720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27272 (or 27266 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 2180720 is about 1476.7261086606. The cubic root of 2180720 is about 129.6780990427.

The spelling of 2180720 in words is "two million, one hundred eighty thousand, seven hundred twenty".