20166697 has 2 divisors, whose sum is σ = 20166698. Its totient is φ = 20166696.

The previous prime is 20166683. The next prime is 20166701. The reversal of 20166697 is 79666102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 488601 = 4436^2 + 699^2 .

It is a cyclic number.

It is not a de Polignac number, because 20166697 - 2¹¹ = 20164649 is a prime.

It is not a weakly prime, because it can be changed into another prime (20166617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10083348 + 10083349.

It is an arithmetic number, because the mean of its divisors is an integer number (10083349).

Almost surely, 2^20166697 is an apocalyptic number.

It is an amenable number.

20166697 is a deficient number, since it is larger than the sum of its proper divisors (1).

20166697 is an equidigital number, since it uses as much as digits as its factorization.

20166697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 20166697 is about 4490.7345724280. The cubic root of 20166697 is about 272.1938182097.

The spelling of 20166697 in words is "twenty million, one hundred sixty-six thousand, six hundred ninety-seven".