20647117 has 2 divisors, whose sum is σ = 20647118. Its totient is φ = 20647116.

The previous prime is 20647111. The next prime is 20647139. The reversal of 20647117 is 71174602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13351716 + 7295401 = 3654^2 + 2701^2 .

It is a cyclic number.

It is not a de Polignac number, because 20647117 - 2¹¹ = 20645069 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 (20647111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10323558 + 10323559.

It is an arithmetic number, because the mean of its divisors is an integer number (10323559).

Almost surely, 2^20647117 is an apocalyptic number.

It is an amenable number.

20647117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20647117 is an equidigital number, since it uses as much as digits as its factorization.

20647117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 20647117 is about 4543.9098802683. The cubic root of 20647117 is about 274.3383188389.

The spelling of 20647117 in words is "twenty million, six hundred forty-seven thousand, one hundred seventeen".