20023391 has 2 divisors, whose sum is σ = 20023392. Its totient is φ = 20023390.

The previous prime is 20023379. The next prime is 20023403. The reversal of 20023391 is 19332002.

It is a balanced prime because it is at equal distance from previous prime (20023379) and next prime (20023403).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20023291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011695 + 10011696.

It is an arithmetic number, because the mean of its divisors is an integer number (10011696).

Almost surely, 2^20023391 is an apocalyptic number.

20023391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023391 is an equidigital number, since it uses as much as digits as its factorization.

20023391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 20023391 is about 4474.7503840997. The cubic root of 20023391 is about 271.5475420025.

Adding to 20023391 its reverse (19332002), we get a palindrome (39355393).

The spelling of 20023391 in words is "twenty million, twenty-three thousand, three hundred ninety-one".