20775413 has 2 divisors, whose sum is σ = 20775414. Its totient is φ = 20775412.

The previous prime is 20775383. The next prime is 20775431. The reversal of 20775413 is 31457702.

Together with next prime (20775431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20775364 + 49 = 4558^2 + 7^2 .

It is a cyclic number.

It is not a de Polignac number, because 20775413 - 2¹⁴ = 20759029 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20775613) 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, 10387706 + 10387707.

It is an arithmetic number, because the mean of its divisors is an integer number (10387707).

Almost surely, 2^20775413 is an apocalyptic number.

It is an amenable number.

20775413 is a deficient number, since it is larger than the sum of its proper divisors (1).

20775413 is an equidigital number, since it uses as much as digits as its factorization.

20775413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20775413 is about 4558.0053751614. The cubic root of 20775413 is about 274.9053690930.

The spelling of 20775413 in words is "twenty million, seven hundred seventy-five thousand, four hundred thirteen".