20443321 has 4 divisors (see below), whose sum is σ = 20452432. Its totient is φ = 20434212.

The previous prime is 20443301. The next prime is 20443331. The reversal of 20443321 is 12334402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20443321 - 2¹⁵ = 20410553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20443301) 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, 1450 + ... + 6556.

It is an arithmetic number, because the mean of its divisors is an integer number (5113108).

Almost surely, 2^20443321 is an apocalyptic number.

It is an amenable number.

20443321 is a deficient number, since it is larger than the sum of its proper divisors (9111).

20443321 is an equidigital number, since it uses as much as digits as its factorization.

20443321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9110.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20443321 is about 4521.4290882419. The cubic root of 20443321 is about 273.4327199883.

Adding to 20443321 its reverse (12334402), we get a palindrome (32777723).

The spelling of 20443321 in words is "twenty million, four hundred forty-three thousand, three hundred twenty-one".