20520017 has 8 divisors (see below), whose sum is σ = 23478912. Its totient is φ = 17568000.

The previous prime is 20519977. The next prime is 20520029. The reversal of 20520017 is 71002502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20520017 - 2⁸ = 20519761 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20519977 and 20520004.

It is not an unprimeable number, because it can be changed into a prime (20520067) 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 7 ways as a sum of consecutive naturals, for example, 10292 + ... + 12122.

It is an arithmetic number, because the mean of its divisors is an integer number (2934864).

Almost surely, 2^20520017 is an apocalyptic number.

It is an amenable number.

20520017 is a deficient number, since it is larger than the sum of its proper divisors (2958895).

20520017 is a wasteful number, since it uses less digits than its factorization.

20520017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3439.

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

The square root of 20520017 is about 4529.9025375829. The cubic root of 20520017 is about 273.7742337268.

Adding to 20520017 its reverse (71002502), we get a palindrome (91522519).

The spelling of 20520017 in words is "twenty million, five hundred twenty thousand, seventeen".