20166959 has 2 divisors, whose sum is σ = 20166960. Its totient is φ = 20166958.

The previous prime is 20166931. The next prime is 20166983. The reversal of 20166959 is 95966102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20166959 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20166359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10083479 + 10083480.

It is an arithmetic number, because the mean of its divisors is an integer number (10083480).

Almost surely, 2^20166959 is an apocalyptic number.

20166959 is a deficient number, since it is larger than the sum of its proper divisors (1).

20166959 is an equidigital number, since it uses as much as digits as its factorization.

20166959 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 20166959 is about 4490.7637435073. The cubic root of 20166959 is about 272.1949969595.

The spelling of 20166959 in words is "twenty million, one hundred sixty-six thousand, nine hundred fifty-nine".