20161297 has 8 divisors (see below), whose sum is σ = 21750120. Its totient is φ = 18577920.

The previous prime is 20161291. The next prime is 20161321. The reversal of 20161297 is 79216102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 99856 + 20061441 = 316^2 + 4479^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20161297 - 2³ = 20161289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20161291) 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 in 7 ways as a sum of consecutive naturals, for example, 9729 + ... + 11617.

It is an arithmetic number, because the mean of its divisors is an integer number (2718765).

Almost surely, 2^20161297 is an apocalyptic number.

It is an amenable number.

20161297 is a deficient number, since it is larger than the sum of its proper divisors (1588823).

20161297 is a wasteful number, since it uses less digits than its factorization.

20161297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2723.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 20161297 is about 4490.1332942353. The cubic root of 20161297 is about 272.1695210920.

Adding to 20161297 its reverse (79216102), we get a palindrome (99377399).

The spelling of 20161297 in words is "twenty million, one hundred sixty-one thousand, two hundred ninety-seven".