20839129 has 2 divisors, whose sum is σ = 20839130. Its totient is φ = 20839128.

The previous prime is 20839109. The next prime is 20839141. The reversal of 20839129 is 92193802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 227529 = 4540^2 + 477^2 .

It is a cyclic number.

It is not a de Polignac number, because 20839129 - 2⁵ = 20839097 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20839094 and 20839103.

It is not a weakly prime, because it can be changed into another prime (20839109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10419564 + 10419565.

It is an arithmetic number, because the mean of its divisors is an integer number (10419565).

Almost surely, 2^20839129 is an apocalyptic number.

It is an amenable number.

20839129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20839129 is an equidigital number, since it uses as much as digits as its factorization.

20839129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20839129 is about 4564.9894852015. The cubic root of 20839129 is about 275.1861175351.

The spelling of 20839129 in words is "twenty million, eight hundred thirty-nine thousand, one hundred twenty-nine".