20681017 has 8 divisors (see below), whose sum is σ = 23662976. Its totient is φ = 17705952.

The previous prime is 20681009. The next prime is 20681021. The reversal of 20681017 is 71018602.

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 20681017 - 2³ = 20681009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20680982 and 20681000.

It is not an unprimeable number, because it can be changed into a prime (20681317) 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 7 ways as a sum of consecutive naturals, for example, 10708 + ... + 12490.

It is an arithmetic number, because the mean of its divisors is an integer number (2957872).

Almost surely, 2^20681017 is an apocalyptic number.

It is an amenable number.

20681017 is a deficient number, since it is larger than the sum of its proper divisors (2981959).

20681017 is a wasteful number, since it uses less digits than its factorization.

20681017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3447.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 20681017 is about 4547.6386180083. The cubic root of 20681017 is about 274.4883798829.

Adding to 20681017 its reverse (71018602), we get a palindrome (91699619).

The spelling of 20681017 in words is "twenty million, six hundred eighty-one thousand, seventeen".