20766133 has 2 divisors, whose sum is σ = 20766134. Its totient is φ = 20766132.

The previous prime is 20766127. The next prime is 20766143. The reversal of 20766133 is 33166702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16990884 + 3775249 = 4122^2 + 1943^2 .

It is a cyclic number.

It is not a de Polignac number, because 20766133 - 2⁵ = 20766101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20766113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10383066 + 10383067.

It is an arithmetic number, because the mean of its divisors is an integer number (10383067).

Almost surely, 2^20766133 is an apocalyptic number.

It is an amenable number.

20766133 is a deficient number, since it is larger than the sum of its proper divisors (1).

20766133 is an equidigital number, since it uses as much as digits as its factorization.

20766133 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 28.

The square root of 20766133 is about 4556.9872723105. The cubic root of 20766133 is about 274.8644312503.

The spelling of 20766133 in words is "twenty million, seven hundred sixty-six thousand, one hundred thirty-three".