20465321 has 2 divisors, whose sum is σ = 20465322. Its totient is φ = 20465320.

The previous prime is 20465309. The next prime is 20465323. The reversal of 20465321 is 12356402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18826921 + 1638400 = 4339^2 + 1280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20465321 is a prime.

Together with 20465323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20465323) 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, 10232660 + 10232661.

It is an arithmetic number, because the mean of its divisors is an integer number (10232661).

Almost surely, 2^20465321 is an apocalyptic number.

It is an amenable number.

20465321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20465321 is an equidigital number, since it uses as much as digits as its factorization.

20465321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20465321 is about 4523.8612931875. The cubic root of 20465321 is about 273.5307693425.

The spelling of 20465321 in words is "twenty million, four hundred sixty-five thousand, three hundred twenty-one".