20306129 has 2 divisors, whose sum is σ = 20306130. Its totient is φ = 20306128.

The previous prime is 20306113. The next prime is 20306131. The reversal of 20306129 is 92160302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14807104 + 5499025 = 3848^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 20306129 - 2⁴ = 20306113 is a prime.

Together with 20306131, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20306149) 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, 10153064 + 10153065.

It is an arithmetic number, because the mean of its divisors is an integer number (10153065).

Almost surely, 2^20306129 is an apocalyptic number.

It is an amenable number.

20306129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20306129 is an equidigital number, since it uses as much as digits as its factorization.

20306129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20306129 is about 4506.2322399095. The cubic root of 20306129 is about 272.8196915708.

The spelling of 20306129 in words is "twenty million, three hundred six thousand, one hundred twenty-nine".