20127321 has 6 divisors (see below), whose sum is σ = 29072810. Its totient is φ = 13418208.

The previous prime is 20127313. The next prime is 20127343. The reversal of 20127321 is 12372102.

It can be written as a sum of positive squares in only one way, i.e., 17015625 + 3111696 = 4125^2 + 1764^2 .

It is not a de Polignac number, because 20127321 - 2³ = 20127313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20127294 and 20127303.

It is not an unprimeable number, because it can be changed into a prime (20127301) 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 in 5 ways as a sum of consecutive naturals, for example, 1118176 + ... + 1118193.

Almost surely, 2^20127321 is an apocalyptic number.

It is an amenable number.

20127321 is a deficient number, since it is larger than the sum of its proper divisors (8945489).

20127321 is a wasteful number, since it uses less digits than its factorization.

20127321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236375 (or 2236372 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 20127321 is about 4486.3482923197. The cubic root of 20127321 is about 272.0165476164.

Adding to 20127321 its reverse (12372102), we get a palindrome (32499423).

The spelling of 20127321 in words is "twenty million, one hundred twenty-seven thousand, three hundred twenty-one".