20731017 has 8 divisors (see below), whose sum is σ = 27662400. Its totient is φ = 13810160.

The previous prime is 20731001. The next prime is 20731043. The reversal of 20731017 is 71013702.

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 20731017 - 2⁴ = 20731001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20730984 and 20731002.

It is not an unprimeable number, because it can be changed into a prime (20731057) 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, 6292 + ... + 9002.

It is an arithmetic number, because the mean of its divisors is an integer number (3457800).

Almost surely, 2^20731017 is an apocalyptic number.

It is an amenable number.

20731017 is a deficient number, since it is larger than the sum of its proper divisors (6931383).

20731017 is a wasteful number, since it uses less digits than its factorization.

20731017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263.

The product of its (nonzero) digits is 294, while the sum is 21.

The square root of 20731017 is about 4553.1326578522. The cubic root of 20731017 is about 274.7094098484.

Adding to 20731017 its reverse (71013702), we get a palindrome (91744719).

The spelling of 20731017 in words is "twenty million, seven hundred thirty-one thousand, seventeen".