20314391 has 2 divisors, whose sum is σ = 20314392. Its totient is φ = 20314390.

The previous prime is 20314379. The next prime is 20314397. The reversal of 20314391 is 19341302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20314391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20314397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10157195 + 10157196.

It is an arithmetic number, because the mean of its divisors is an integer number (10157196).

Almost surely, 2^20314391 is an apocalyptic number.

20314391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20314391 is an equidigital number, since it uses as much as digits as its factorization.

20314391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 20314391 is about 4507.1488770619. The cubic root of 20314391 is about 272.8566874726.

Adding to 20314391 its reverse (19341302), we get a palindrome (39655693).

The spelling of 20314391 in words is "twenty million, three hundred fourteen thousand, three hundred ninety-one".