3221020 has 36 divisors (see below), whose sum is σ = 7440552. Its totient is φ = 1171280.

The previous prime is 3221017. The next prime is 3221033. The reversal of 3221020 is 201223.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 3220988 and 3221006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 292815 + ... + 292825.

It is an arithmetic number, because the mean of its divisors is an integer number (206682).

Almost surely, 2^3221020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3221020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3720276).

3221020 is an abundant number, since it is smaller than the sum of its proper divisors (4219532).

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

3221020 is an frugal number, since it uses more digits than its factorization.

3221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64 (or 18 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 3221020 is about 1794.7200338772. The cubic root of 3221020 is about 147.6832157809.

Adding to 3221020 its reverse (201223), we get a palindrome (3422243).

The spelling of 3221020 in words is "three million, two hundred twenty-one thousand, twenty".