20683717 has 2 divisors, whose sum is σ = 20683718. Its totient is φ = 20683716.

The previous prime is 20683709. The next prime is 20683763. The reversal of 20683717 is 71738602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17589636 + 3094081 = 4194^2 + 1759^2 .

It is a cyclic number.

It is not a de Polignac number, because 20683717 - 2³ = 20683709 is a prime.

It is a super-2 number, since 2×20683717² = 855632297872178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20683787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10341858 + 10341859.

It is an arithmetic number, because the mean of its divisors is an integer number (10341859).

Almost surely, 2^20683717 is an apocalyptic number.

It is an amenable number.

20683717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20683717 is an equidigital number, since it uses as much as digits as its factorization.

20683717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 20683717 is about 4547.9354656811. The cubic root of 20683717 is about 274.5003245949.

The spelling of 20683717 in words is "twenty million, six hundred eighty-three thousand, seven hundred seventeen".