20240321 has 4 divisors (see below), whose sum is σ = 20252100. Its totient is φ = 20228544.

The previous prime is 20240293. The next prime is 20240323. The reversal of 20240321 is 12304202.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 14899600 + 5340721 = 3860^2 + 2311^2 .

It is a cyclic number.

It is not a de Polignac number, because 20240321 - 2⁶ = 20240257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20240296 and 20240305.

It is not an unprimeable number, because it can be changed into a prime (20240323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2756 + ... + 6933.

It is an arithmetic number, because the mean of its divisors is an integer number (5063025).

Almost surely, 2^20240321 is an apocalyptic number.

It is an amenable number.

20240321 is a deficient number, since it is larger than the sum of its proper divisors (11779).

20240321 is an equidigital number, since it uses as much as digits as its factorization.

20240321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11778.

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

The square root of 20240321 is about 4498.9244270159. The cubic root of 20240321 is about 272.5246550652.

Adding to 20240321 its reverse (12304202), we get a palindrome (32544523).

The spelling of 20240321 in words is "twenty million, two hundred forty thousand, three hundred twenty-one".