20243002391 has 2 divisors, whose sum is σ = 20243002392. Its totient is φ = 20243002390.

The previous prime is 20243002349. The next prime is 20243002411. The reversal of 20243002391 is 19320034202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20243002391 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20243002391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20243062391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10121501195 + 10121501196.

It is an arithmetic number, because the mean of its divisors is an integer number (10121501196).

Almost surely, 2^20243002391 is an apocalyptic number.

20243002391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20243002391 is an equidigital number, since it uses as much as digits as its factorization.

20243002391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 20243002391 its reverse (19320034202), we get a palindrome (39563036593).

The spelling of 20243002391 in words is "twenty billion, two hundred forty-three million, two thousand, three hundred ninety-one".