20316331 has 12 divisors (see below), whose sum is σ = 24082272. Its totient is φ = 17083248.

The previous prime is 20316323. The next prime is 20316341. The reversal of 20316331 is 13361302.

It is not a de Polignac number, because 20316331 - 2³ = 20316323 is a prime.

It is a super-2 number, since 2×20316331² = 825506610603122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20316299 and 20316308.

It is not an unprimeable number, because it can be changed into a prime (20316341) 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, 1315 + ... + 6508.

It is an arithmetic number, because the mean of its divisors is an integer number (2006856).

Almost surely, 2^20316331 is an apocalyptic number.

20316331 is a deficient number, since it is larger than the sum of its proper divisors (3765941).

20316331 is an equidigital number, since it uses as much as digits as its factorization.

20316331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7890 (or 7883 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 20316331 is about 4507.3640855826. The cubic root of 20316331 is about 272.8653730250.

Adding to 20316331 its reverse (13361302), we get a palindrome (33677633).

The spelling of 20316331 in words is "twenty million, three hundred sixteen thousand, three hundred thirty-one".