20168129 has 2 divisors, whose sum is σ = 20168130. Its totient is φ = 20168128.

The previous prime is 20168119. The next prime is 20168149. The reversal of 20168129 is 92186102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12439729 + 7728400 = 3527^2 + 2780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20168129 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20168119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10084064 + 10084065.

It is an arithmetic number, because the mean of its divisors is an integer number (10084065).

Almost surely, 2^20168129 is an apocalyptic number.

It is an amenable number.

20168129 is a deficient number, since it is larger than the sum of its proper divisors (1).

20168129 is an equidigital number, since it uses as much as digits as its factorization.

20168129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 20168129 is about 4490.8940089920. The cubic root of 20168129 is about 272.2002607177.

The spelling of 20168129 in words is "twenty million, one hundred sixty-eight thousand, one hundred twenty-nine".