20064391 has 2 divisors, whose sum is σ = 20064392. Its totient is φ = 20064390.

The previous prime is 20064389. The next prime is 20064413. The reversal of 20064391 is 19346002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20064391 - 2¹ = 20064389 is a prime.

Together with 20064389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20064311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10032195 + 10032196.

It is an arithmetic number, because the mean of its divisors is an integer number (10032196).

Almost surely, 2^20064391 is an apocalyptic number.

20064391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20064391 is an equidigital number, since it uses as much as digits as its factorization.

20064391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20064391 is about 4479.3293024738. The cubic root of 20064391 is about 271.7327563665.

The spelling of 20064391 in words is "twenty million, sixty-four thousand, three hundred ninety-one".