20131517 has 8 divisors (see below), whose sum is σ = 23040576. Its totient is φ = 17230752.

The previous prime is 20131513. The next prime is 20131523. The reversal of 20131517 is 71513102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20131517 - 2² = 20131513 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131513) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4553 + ... + 7809.

It is an arithmetic number, because the mean of its divisors is an integer number (2880072).

Almost surely, 2^20131517 is an apocalyptic number.

It is an amenable number.

20131517 is a deficient number, since it is larger than the sum of its proper divisors (2909059).

20131517 is an equidigital number, since it uses as much as digits as its factorization.

20131517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4147.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 20131517 is about 4486.8159088601. The cubic root of 20131517 is about 272.0354489914.

Adding to 20131517 its reverse (71513102), we get a palindrome (91644619).

The spelling of 20131517 in words is "twenty million, one hundred thirty-one thousand, five hundred seventeen".