20323211081 has 2 divisors, whose sum is σ = 20323211082. Its totient is φ = 20323211080.

The previous prime is 20323210979. The next prime is 20323211101. The reversal of 20323211081 is 18011232302.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13591829056 + 6731382025 = 116584^2 + 82045^2 .

It is a cyclic number.

It is not a de Polignac number, because 20323211081 - 2¹⁸ = 20322948937 is a prime.

It is a super-3 number, since 3×20323211081³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (20323210081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161605540 + 10161605541.

It is an arithmetic number, because the mean of its divisors is an integer number (10161605541).

Almost surely, 2^20323211081 is an apocalyptic number.

It is an amenable number.

20323211081 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323211081 is an equidigital number, since it uses as much as digits as its factorization.

20323211081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 20323211081 its reverse (18011232302), we get a palindrome (38334443383).

The spelling of 20323211081 in words is "twenty billion, three hundred twenty-three million, two hundred eleven thousand, eighty-one".