20001323231 has 2 divisors, whose sum is σ = 20001323232. Its totient is φ = 20001323230.

The previous prime is 20001323179. The next prime is 20001323233. The reversal of 20001323231 is 13232310002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001323231 - 2²² = 19997128927 is a prime.

It is a super-2 number, since 2×20001323231² (a number of 21 digits) contains 22 as substring.

Together with 20001323233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001323233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000661615 + 10000661616.

It is an arithmetic number, because the mean of its divisors is an integer number (10000661616).

Almost surely, 2^20001323231 is an apocalyptic number.

20001323231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001323231 is an equidigital number, since it uses as much as digits as its factorization.

20001323231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20001323231 its reverse (13232310002), we get a palindrome (33233633233).

It can be divided in two parts, 2000 and 1323231, that added together give a palindrome (1325231).

The spelling of 20001323231 in words is "twenty billion, one million, three hundred twenty-three thousand, two hundred thirty-one".