20031317 has 4 divisors (see below), whose sum is σ = 20119020. Its totient is φ = 19943616.

The previous prime is 20031313. The next prime is 20031331. The reversal of 20031317 is 71313002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18369796 + 1661521 = 4286^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 20031317 - 2² = 20031313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20031295 and 20031304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20031311) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 43508 + ... + 43965.

It is an arithmetic number, because the mean of its divisors is an integer number (5029755).

Almost surely, 2^20031317 is an apocalyptic number.

It is an amenable number.

20031317 is a deficient number, since it is larger than the sum of its proper divisors (87703).

20031317 is an equidigital number, since it uses as much as digits as its factorization.

20031317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87702.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 20031317 is about 4475.6359324681. The cubic root of 20031317 is about 271.5833668019.

Adding to 20031317 its reverse (71313002), we get a palindrome (91344319).

The spelling of 20031317 in words is "twenty million, thirty-one thousand, three hundred seventeen".