20766717 has 12 divisors (see below), whose sum is σ = 30444960. Its totient is φ = 13637448.

The previous prime is 20766701. The next prime is 20766751. The reversal of 20766717 is 71766702.

It is not a de Polignac number, because 20766717 - 2⁴ = 20766701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20766817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16617 + ... + 17822.

It is an arithmetic number, because the mean of its divisors is an integer number (2537080).

Almost surely, 2^20766717 is an apocalyptic number.

It is an amenable number.

20766717 is a deficient number, since it is larger than the sum of its proper divisors (9678243).

20766717 is a wasteful number, since it uses less digits than its factorization.

20766717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34512 (or 34509 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 20766717 is about 4557.0513492828. The cubic root of 20766717 is about 274.8670078707.

The spelling of 20766717 in words is "twenty million, seven hundred sixty-six thousand, seven hundred seventeen".