20710717 has 2 divisors, whose sum is σ = 20710718. Its totient is φ = 20710716.

The previous prime is 20710687. The next prime is 20710721. The reversal of 20710717 is 71701702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13388281 + 7322436 = 3659^2 + 2706^2 .

It is a cyclic number.

It is not a de Polignac number, because 20710717 - 2²³ = 12322109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20710691 and 20710700.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20710747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10355358 + 10355359.

It is an arithmetic number, because the mean of its divisors is an integer number (10355359).

Almost surely, 2^20710717 is an apocalyptic number.

It is an amenable number.

20710717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20710717 is an equidigital number, since it uses as much as digits as its factorization.

20710717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 686, while the sum is 25.

The square root of 20710717 is about 4550.9028774519. The cubic root of 20710717 is about 274.6197145828.

The spelling of 20710717 in words is "twenty million, seven hundred ten thousand, seven hundred seventeen".