20303391 has 4 divisors (see below), whose sum is σ = 27071192. Its totient is φ = 13535592.

The previous prime is 20303351. The next prime is 20303431. The reversal of 20303391 is 19330302.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20303351) and next prime (20303431).

It is not a de Polignac number, because 20303391 - 2¹⁰ = 20302367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303351) 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, 3383896 + ... + 3383901.

It is an arithmetic number, because the mean of its divisors is an integer number (6767798).

Almost surely, 2^20303391 is an apocalyptic number.

20303391 is a deficient number, since it is larger than the sum of its proper divisors (6767801).

20303391 is an equidigital number, since it uses as much as digits as its factorization.

20303391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6767800.

The product of its (nonzero) digits is 486, while the sum is 21.

The square root of 20303391 is about 4505.9284281932. The cubic root of 20303391 is about 272.8074290352.

Adding to 20303391 its reverse (19330302), we get a palindrome (39633693).

The spelling of 20303391 in words is "twenty million, three hundred three thousand, three hundred ninety-one".