20120517 has 12 divisors (see below), whose sum is σ = 29739424. Its totient is φ = 13101480.

The previous prime is 20120509. The next prime is 20120531. The reversal of 20120517 is 71502102.

It is not a de Polignac number, because 20120517 - 2³ = 20120509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20120517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25609 + ... + 26382.

Almost surely, 2^20120517 is an apocalyptic number.

It is an amenable number.

20120517 is a deficient number, since it is larger than the sum of its proper divisors (9618907).

20120517 is a wasteful number, since it uses less digits than its factorization.

20120517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52040 (or 52037 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 20120517 is about 4485.5899277576. The cubic root of 20120517 is about 271.9858926146.

Adding to 20120517 its reverse (71502102), we get a palindrome (91622619).

The spelling of 20120517 in words is "twenty million, one hundred twenty thousand, five hundred seventeen".