20312143081 has 2 divisors, whose sum is σ = 20312143082. Its totient is φ = 20312143080.

The previous prime is 20312143057. The next prime is 20312143121. The reversal of 20312143081 is 18034121302.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18972583081 + 1339560000 = 137741^2 + 36600^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312143081 - 2¹⁹ = 20311618793 is a prime.

It is a super-2 number, since 2×20312143081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20312143681) 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, 10156071540 + 10156071541.

It is an arithmetic number, because the mean of its divisors is an integer number (10156071541).

Almost surely, 2^20312143081 is an apocalyptic number.

It is an amenable number.

20312143081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20312143081 is an equidigital number, since it uses as much as digits as its factorization.

20312143081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 20312143081 its reverse (18034121302), we get a palindrome (38346264383).

The spelling of 20312143081 in words is "twenty billion, three hundred twelve million, one hundred forty-three thousand, eighty-one".