20303321 has 8 divisors (see below), whose sum is σ = 21696840. Its totient is φ = 18931968.

The previous prime is 20303299. The next prime is 20303329. The reversal of 20303321 is 12330302.

It can be written as a sum of positive squares in 4 ways, for example, as 8497225 + 11806096 = 2915^2 + 3436^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20303321 - 2¹⁰ = 20302297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20303296 and 20303305.

It is not an unprimeable number, because it can be changed into a prime (20303329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3626 + ... + 7331.

It is an arithmetic number, because the mean of its divisors is an integer number (2712105).

Almost surely, 2^20303321 is an apocalyptic number.

It is an amenable number.

20303321 is a deficient number, since it is larger than the sum of its proper divisors (1393519).

20303321 is a wasteful number, since it uses less digits than its factorization.

20303321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11083.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 20303321 is about 4505.9206606420. The cubic root of 20303321 is about 272.8071155154.

Adding to 20303321 its reverse (12330302), we get a palindrome (32633623).

The spelling of 20303321 in words is "twenty million, three hundred three thousand, three hundred twenty-one".