20003230991 has 2 divisors, whose sum is σ = 20003230992. Its totient is φ = 20003230990.

The previous prime is 20003230987. The next prime is 20003231011. The reversal of 20003230991 is 19903230002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20003230991 - 2² = 20003230987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20003236991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001615495 + 10001615496.

It is an arithmetic number, because the mean of its divisors is an integer number (10001615496).

Almost surely, 2^20003230991 is an apocalyptic number.

20003230991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003230991 is an equidigital number, since it uses as much as digits as its factorization.

20003230991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 29.

Adding to 20003230991 its reverse (19903230002), we get a palindrome (39906460993).

The spelling of 20003230991 in words is "twenty billion, three million, two hundred thirty thousand, nine hundred ninety-one".