20345331 has 12 divisors (see below), whose sum is σ = 28034376. Its totient is φ = 13124160.

The previous prime is 20345293. The next prime is 20345357. The reversal of 20345331 is 13354302.

It is not a de Polignac number, because 20345331 - 2⁶ = 20345267 is a prime.

It is a super-2 number, since 2×20345331² = 827864986999122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20345298 and 20345307.

It is not an unprimeable number, because it can be changed into a prime (20345231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 646 + ... + 6411.

It is an arithmetic number, because the mean of its divisors is an integer number (2336198).

Almost surely, 2^20345331 is an apocalyptic number.

20345331 is a deficient number, since it is larger than the sum of its proper divisors (7689045).

20345331 is an equidigital number, since it uses as much as digits as its factorization.

20345331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7122 (or 7091 counting only the distinct ones).

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

The square root of 20345331 is about 4510.5798961996. The cubic root of 20345331 is about 272.9951427439.

Adding to 20345331 its reverse (13354302), we get a palindrome (33699633).

The spelling of 20345331 in words is "twenty million, three hundred forty-five thousand, three hundred thirty-one".