20020517 has 4 divisors (see below), whose sum is σ = 21840576. Its totient is φ = 18200460.

The previous prime is 20020501. The next prime is 20020531. The reversal of 20020517 is 71502002.

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.

It is a cyclic number.

It is not a de Polignac number, because 20020517 - 2⁴ = 20020501 is a prime.

It is a super-2 number, since 2×20020517² = 801642201894578, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020495 and 20020504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020537) 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, 910013 + ... + 910034.

It is an arithmetic number, because the mean of its divisors is an integer number (5460144).

Almost surely, 2^20020517 is an apocalyptic number.

It is an amenable number.

20020517 is a deficient number, since it is larger than the sum of its proper divisors (1820059).

20020517 is a wasteful number, since it uses less digits than its factorization.

20020517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820058.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 20020517 is about 4474.4292373441. The cubic root of 20020517 is about 271.5345494483.

Adding to 20020517 its reverse (71502002), we get a palindrome (91522519).

The spelling of 20020517 in words is "twenty million, twenty thousand, five hundred seventeen".