20201517 has 12 divisors (see below), whose sum is σ = 33348640. Its totient is φ = 11543688.

The previous prime is 20201507. The next prime is 20201527. The reversal of 20201517 is 71510202.

It is an interprime number because it is at equal distance from previous prime (20201507) and next prime (20201527).

It is not a de Polignac number, because 20201517 - 2⁴ = 20201501 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 20201517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201507) 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, 160267 + ... + 160392.

Almost surely, 2^20201517 is an apocalyptic number.

It is an amenable number.

20201517 is a deficient number, since it is larger than the sum of its proper divisors (13147123).

20201517 is a wasteful number, since it uses less digits than its factorization.

20201517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320672 (or 320669 counting only the distinct ones).

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

The square root of 20201517 is about 4494.6097717154. The cubic root of 20201517 is about 272.3503855637.

Adding to 20201517 its reverse (71510202), we get a palindrome (91711719).

The spelling of 20201517 in words is "twenty million, two hundred one thousand, five hundred seventeen".