3220520 has 16 divisors (see below), whose sum is σ = 7246260. Its totient is φ = 1288192.

The previous prime is 3220513. The next prime is 3220523. The reversal of 3220520 is 250223.

It can be written as a sum of positive squares in 2 ways, for example, as 2669956 + 550564 = 1634^2 + 742^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3220495 and 3220504.

It is not an unprimeable number, because it can be changed into a prime (3220523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40217 + ... + 40296.

Almost surely, 2^3220520 is an apocalyptic number.

It is an amenable number.

3220520 is an abundant number, since it is smaller than the sum of its proper divisors (4025740).

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

3220520 is a wasteful number, since it uses less digits than its factorization.

3220520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80524 (or 80520 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 3220520 is about 1794.5807309787. The cubic root of 3220520 is about 147.6755737473.

Adding to 3220520 its reverse (250223), we get a palindrome (3470743).

The spelling of 3220520 in words is "three million, two hundred twenty thousand, five hundred twenty".