20327309 has 2 divisors, whose sum is σ = 20327310. Its totient is φ = 20327308.

The previous prime is 20327299. The next prime is 20327311. The reversal of 20327309 is 90372302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19386409 + 940900 = 4403^2 + 970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20327309 is a prime.

Together with 20327311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20327369) 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, 10163654 + 10163655.

It is an arithmetic number, because the mean of its divisors is an integer number (10163655).

Almost surely, 2^20327309 is an apocalyptic number.

It is an amenable number.

20327309 is a deficient number, since it is larger than the sum of its proper divisors (1).

20327309 is an equidigital number, since it uses as much as digits as its factorization.

20327309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 20327309 is about 4508.5817060357. The cubic root of 20327309 is about 272.9145120925.

The spelling of 20327309 in words is "twenty million, three hundred twenty-seven thousand, three hundred nine".