20113517 has 4 divisors (see below), whose sum is σ = 20123040. Its totient is φ = 20103996.

The previous prime is 20113507. The next prime is 20113537. The reversal of 20113517 is 71531102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20113517 - 2⁶ = 20113453 is a prime.

It is a super-2 number, since 2×20113517² = 809107132218578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113507) 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, 17 + ... + 6342.

It is an arithmetic number, because the mean of its divisors is an integer number (5030760).

Almost surely, 2^20113517 is an apocalyptic number.

It is an amenable number.

20113517 is a deficient number, since it is larger than the sum of its proper divisors (9523).

20113517 is an equidigital number, since it uses as much as digits as its factorization.

20113517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9522.

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

The square root of 20113517 is about 4484.8095834717. The cubic root of 20113517 is about 271.9543473337.

Adding to 20113517 its reverse (71531102), we get a palindrome (91644619).

The spelling of 20113517 in words is "twenty million, one hundred thirteen thousand, five hundred seventeen".