20072917 has 2 divisors, whose sum is σ = 20072918. Its totient is φ = 20072916.

The previous prime is 20072867. The next prime is 20072933. The reversal of 20072917 is 71927002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18198756 + 1874161 = 4266^2 + 1369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20072917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20072947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10036458 + 10036459.

It is an arithmetic number, because the mean of its divisors is an integer number (10036459).

Almost surely, 2^20072917 is an apocalyptic number.

It is an amenable number.

20072917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20072917 is an equidigital number, since it uses as much as digits as its factorization.

20072917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 20072917 is about 4480.2809063718. The cubic root of 20072917 is about 271.7712402224.

Adding to 20072917 its reverse (71927002), we get a palindrome (91999919).

The spelling of 20072917 in words is "twenty million, seventy-two thousand, nine hundred seventeen".