20361917 has 2 divisors, whose sum is σ = 20361918. Its totient is φ = 20361916.

The previous prime is 20361889. The next prime is 20361941. The reversal of 20361917 is 71916302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17884441 + 2477476 = 4229^2 + 1574^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20361917 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20361917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20361997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10180958 + 10180959.

It is an arithmetic number, because the mean of its divisors is an integer number (10180959).

Almost surely, 2^20361917 is an apocalyptic number.

It is an amenable number.

20361917 is a deficient number, since it is larger than the sum of its proper divisors (1).

20361917 is an equidigital number, since it uses as much as digits as its factorization.

20361917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 20361917 is about 4512.4180878992. The cubic root of 20361917 is about 273.0693066487.

The spelling of 20361917 in words is "twenty million, three hundred sixty-one thousand, nine hundred seventeen".