20321331 has 8 divisors (see below), whose sum is σ = 27118800. Its totient is φ = 13535712.

The previous prime is 20321303. The next prime is 20321339. The reversal of 20321331 is 13312302.

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

It is not a de Polignac number, because 20321331 - 2¹⁸ = 20059187 is a prime.

It is a super-2 number, since 2×20321331² = 825912987223122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20321331.

It is not an unprimeable number, because it can be changed into a prime (20321339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2461 + ... + 6833.

It is an arithmetic number, because the mean of its divisors is an integer number (3389850).

Almost surely, 2^20321331 is an apocalyptic number.

20321331 is a deficient number, since it is larger than the sum of its proper divisors (6797469).

20321331 is a wasteful number, since it uses less digits than its factorization.

20321331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5925.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 20321331 is about 4507.9186993556. The cubic root of 20321331 is about 272.8877559207.

Adding to 20321331 its reverse (13312302), we get a palindrome (33633633).

The spelling of 20321331 in words is "twenty million, three hundred twenty-one thousand, three hundred thirty-one".