20814331 has 4 divisors (see below), whose sum is σ = 20844000. Its totient is φ = 20784664.

The previous prime is 20814317. The next prime is 20814337. The reversal of 20814331 is 13341802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13341802 = 2 ⋅6670901.

It is a cyclic number.

It is not a de Polignac number, because 20814331 - 2⁷ = 20814203 is a prime.

It is a super-2 number, since 2×20814331² = 866472749955122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20814337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13756 + ... + 15193.

It is an arithmetic number, because the mean of its divisors is an integer number (5211000).

Almost surely, 2^20814331 is an apocalyptic number.

20814331 is a deficient number, since it is larger than the sum of its proper divisors (29669).

20814331 is an equidigital number, since it uses as much as digits as its factorization.

20814331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29668.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20814331 is about 4562.2725696740. The cubic root of 20814331 is about 275.0769195299.

The spelling of 20814331 in words is "twenty million, eight hundred fourteen thousand, three hundred thirty-one".