20171313 has 12 divisors (see below), whose sum is σ = 29547648. Its totient is φ = 13257720.

The previous prime is 20171279. The next prime is 20171317. The reversal of 20171313 is 31317102.

It is not a de Polignac number, because 20171313 - 2¹⁶ = 20105777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20171317) 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, 15145 + ... + 16422.

It is an arithmetic number, because the mean of its divisors is an integer number (2462304).

Almost surely, 2^20171313 is an apocalyptic number.

It is an amenable number.

20171313 is a deficient number, since it is larger than the sum of its proper divisors (9376335).

20171313 is a wasteful number, since it uses less digits than its factorization.

20171313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31644 (or 31641 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 20171313 is about 4491.2484901194. The cubic root of 20171313 is about 272.2145843076.

Adding to 20171313 its reverse (31317102), we get a palindrome (51488415).

The spelling of 20171313 in words is "twenty million, one hundred seventy-one thousand, three hundred thirteen".