3200720 has 20 divisors (see below), whose sum is σ = 7441860. Its totient is φ = 1280256.

The previous prime is 3200689. The next prime is 3200737. The reversal of 3200720 is 270023.

It can be written as a sum of positive squares in 2 ways, for example, as 2521744 + 678976 = 1588^2 + 824^2 .

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

3200720 is a modest number, since divided by 720 gives 320 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 3200695 and 3200704.

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, 19925 + ... + 20084.

It is an arithmetic number, because the mean of its divisors is an integer number (372093).

Almost surely, 2^3200720 is an apocalyptic number.

It is an amenable number.

3200720 is an abundant number, since it is smaller than the sum of its proper divisors (4241140).

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

3200720 is a wasteful number, since it uses less digits than its factorization.

3200720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40022 (or 40016 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 14.

The square root of 3200720 is about 1789.0556167990. The cubic root of 3200720 is about 147.3723112113.

Adding to 3200720 its reverse (270023), we get a palindrome (3470743).

The spelling of 3200720 in words is "three million, two hundred thousand, seven hundred twenty".