20322221 has 4 divisors (see below), whose sum is σ = 20333244. Its totient is φ = 20311200.

The previous prime is 20322199. The next prime is 20322227. The reversal of 20322221 is 12222302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12222302 = 2 ⋅6111151.

It can be written as a sum of positive squares in 2 ways, for example, as 15100996 + 5221225 = 3886^2 + 2285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20322221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20322196 and 20322205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20322227) 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, 2000 + ... + 6681.

It is an arithmetic number, because the mean of its divisors is an integer number (5083311).

Almost surely, 2^20322221 is an apocalyptic number.

It is an amenable number.

20322221 is a deficient number, since it is larger than the sum of its proper divisors (11023).

20322221 is an equidigital number, since it uses as much as digits as its factorization.

20322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11022.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20322221 is about 4508.0174134535. The cubic root of 20322221 is about 272.8917396913.

Adding to 20322221 its reverse (12222302), we get a palindrome (32544523).

The spelling of 20322221 in words is "twenty million, three hundred twenty-two thousand, two hundred twenty-one".