8221020 has 48 divisors (see below), whose sum is σ = 23176608. Its totient is φ = 2177280.

The previous prime is 8221009. The next prime is 8221021. The reversal of 8221020 is 201228.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8221021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10482 + ... + 11238.

It is an arithmetic number, because the mean of its divisors is an integer number (482846).

Almost surely, 2^8221020 is an apocalyptic number.

It is an amenable number.

8221020 is an abundant number, since it is smaller than the sum of its proper divisors (14955588).

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

8221020 is a wasteful number, since it uses less digits than its factorization.

8221020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950 (or 948 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 8221020 is about 2867.2321147755. The cubic root of 8221020 is about 201.8251272226.

Adding to 8221020 its reverse (201228), we get a palindrome (8422248).

The spelling of 8221020 in words is "eight million, two hundred twenty-one thousand, twenty".