20331345 has 8 divisors (see below), whose sum is σ = 32530176. Its totient is φ = 10843376.

The previous prime is 20331329. The next prime is 20331373. The reversal of 20331345 is 54313302.

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 20331345 - 2⁴ = 20331329 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 677697 + ... + 677726.

It is an arithmetic number, because the mean of its divisors is an integer number (4066272).

Almost surely, 2^20331345 is an apocalyptic number.

It is an amenable number.

20331345 is a deficient number, since it is larger than the sum of its proper divisors (12198831).

20331345 is a wasteful number, since it uses less digits than its factorization.

20331345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355431.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 20331345 is about 4509.0292746887. The cubic root of 20331345 is about 272.9325733466.

Adding to 20331345 its reverse (54313302), we get a palindrome (74644647).

The spelling of 20331345 in words is "twenty million, three hundred thirty-one thousand, three hundred forty-five".