20966017 has 2 divisors, whose sum is σ = 20966018. Its totient is φ = 20966016.

The previous prime is 20966003. The next prime is 20966027. The reversal of 20966017 is 71066902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15808576 + 5157441 = 3976^2 + 2271^2 .

It is a cyclic number.

It is not a de Polignac number, because 20966017 - 2¹⁵ = 20933249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20966017.

It is not a weakly prime, because it can be changed into another prime (20966027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10483008 + 10483009.

It is an arithmetic number, because the mean of its divisors is an integer number (10483009).

Almost surely, 2^20966017 is an apocalyptic number.

It is an amenable number.

20966017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20966017 is an equidigital number, since it uses as much as digits as its factorization.

20966017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20966017 is about 4578.8663444132. The cubic root of 20966017 is about 275.7435174171.

The spelling of 20966017 in words is "twenty million, nine hundred sixty-six thousand, seventeen".