20709017 has 12 divisors (see below), whose sum is σ = 24216336. Its totient is φ = 17657640.

The previous prime is 20708971. The next prime is 20709041. The reversal of 20709017 is 71090702.

It is not a de Polignac number, because 20709017 - 2⁶ = 20708953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20709217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9338 + ... + 11340.

It is an arithmetic number, because the mean of its divisors is an integer number (2018028).

Almost surely, 2^20709017 is an apocalyptic number.

It is an amenable number.

20709017 is a deficient number, since it is larger than the sum of its proper divisors (3507319).

20709017 is a wasteful number, since it uses less digits than its factorization.

20709017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2228 (or 2221 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 26.

The square root of 20709017 is about 4550.7160974950. The cubic root of 20709017 is about 274.6122004974.

Adding to 20709017 its reverse (71090702), we get a palindrome (91799719).

The spelling of 20709017 in words is "twenty million, seven hundred nine thousand, seventeen".