20001323131 has 2 divisors, whose sum is σ = 20001323132. Its totient is φ = 20001323130.

The previous prime is 20001323119. The next prime is 20001323159. The reversal of 20001323131 is 13132310002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20001323131 - 2²⁵ = 19967768699 is a prime.

It is a super-2 number, since 2×20001323131² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20001323231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000661565 + 10000661566.

It is an arithmetic number, because the mean of its divisors is an integer number (10000661566).

Almost surely, 2^20001323131 is an apocalyptic number.

20001323131 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001323131 is an equidigital number, since it uses as much as digits as its factorization.

20001323131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 20001323131 its reverse (13132310002), we get a palindrome (33133633133).

The spelling of 20001323131 in words is "twenty billion, one million, three hundred twenty-three thousand, one hundred thirty-one".