20169349 has 2 divisors, whose sum is σ = 20169350. Its totient is φ = 20169348.

The previous prime is 20169323. The next prime is 20169353. The reversal of 20169349 is 94396102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10824100 + 9345249 = 3290^2 + 3057^2 .

It is a cyclic number.

It is not a de Polignac number, because 20169349 - 2¹³ = 20161157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20169379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10084674 + 10084675.

It is an arithmetic number, because the mean of its divisors is an integer number (10084675).

Almost surely, 2^20169349 is an apocalyptic number.

It is an amenable number.

20169349 is a deficient number, since it is larger than the sum of its proper divisors (1).

20169349 is an equidigital number, since it uses as much as digits as its factorization.

20169349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20169349 is about 4491.0298373536. The cubic root of 20169349 is about 272.2057492060.

The spelling of 20169349 in words is "twenty million, one hundred sixty-nine thousand, three hundred forty-nine".