20131715 has 4 divisors (see below), whose sum is σ = 24158064. Its totient is φ = 16105368.

The previous prime is 20131681. The next prime is 20131717. The reversal of 20131715 is 51713102.

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

It is a cyclic number.

It is not a de Polignac number, because 20131715 - 2¹² = 20127619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131717) 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, 2013167 + ... + 2013176.

It is an arithmetic number, because the mean of its divisors is an integer number (6039516).

Almost surely, 2^20131715 is an apocalyptic number.

20131715 is a deficient number, since it is larger than the sum of its proper divisors (4026349).

20131715 is an equidigital number, since it uses as much as digits as its factorization.

20131715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4026348.

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

The square root of 20131715 is about 4486.8379734508. The cubic root of 20131715 is about 272.0363408408.

Adding to 20131715 its reverse (51713102), we get a palindrome (71844817).

The spelling of 20131715 in words is "twenty million, one hundred thirty-one thousand, seven hundred fifteen".