20330331 has 8 divisors (see below), whose sum is σ = 30979584. Its totient is φ = 11617320.

The previous prime is 20330309. The next prime is 20330333. The reversal of 20330331 is 13303302.

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

It is a de Polignac number, because none of the positive numbers 2^k-20330331 is a prime.

It is a super-2 number, since 2×20330331² = 826644717139122, 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 20330331.

It is not an unprimeable number, because it can be changed into a prime (20330333) 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, 484035 + ... + 484076.

It is an arithmetic number, because the mean of its divisors is an integer number (3872448).

Almost surely, 2^20330331 is an apocalyptic number.

20330331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20330331 is a deficient number, since it is larger than the sum of its proper divisors (10649253).

20330331 is an equidigital number, since it uses as much as digits as its factorization.

20330331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 968121.

The product of its (nonzero) digits is 162, while the sum is 15.

The square root of 20330331 is about 4508.9168322337. The cubic root of 20330331 is about 272.9280358827.

Adding to 20330331 its reverse (13303302), we get a palindrome (33633633).

The spelling of 20330331 in words is "twenty million, three hundred thirty thousand, three hundred thirty-one".