20455129 has 2 divisors, whose sum is σ = 20455130. Its totient is φ = 20455128.

The previous prime is 20455109. The next prime is 20455139. The reversal of 20455129 is 92155402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18905104 + 1550025 = 4348^2 + 1245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20455129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20455097 and 20455106.

It is not a weakly prime, because it can be changed into another prime (20455109) 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, 10227564 + 10227565.

It is an arithmetic number, because the mean of its divisors is an integer number (10227565).

Almost surely, 2^20455129 is an apocalyptic number.

It is an amenable number.

20455129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20455129 is an equidigital number, since it uses as much as digits as its factorization.

20455129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 20455129 is about 4522.7346815837. The cubic root of 20455129 is about 273.4853544914.

The spelling of 20455129 in words is "twenty million, four hundred fifty-five thousand, one hundred twenty-nine".