20013317 has 4 divisors (see below), whose sum is σ = 20190540. Its totient is φ = 19836096.

The previous prime is 20013313. The next prime is 20013319. The reversal of 20013317 is 71331002.

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 2989441 + 17023876 = 1729^2 + 4126^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013317 - 2² = 20013313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20013295 and 20013304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88442 + ... + 88667.

It is an arithmetic number, because the mean of its divisors is an integer number (5047635).

Almost surely, 2^20013317 is an apocalyptic number.

It is an amenable number.

20013317 is a deficient number, since it is larger than the sum of its proper divisors (177223).

20013317 is a wasteful number, since it uses less digits than its factorization.

20013317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177222.

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

The square root of 20013317 is about 4473.6245931012. The cubic root of 20013317 is about 271.5019947917.

Adding to 20013317 its reverse (71331002), we get a palindrome (91344319).

The spelling of 20013317 in words is "twenty million, thirteen thousand, three hundred seventeen".