20322343233581 has 2 divisors, whose sum is σ = 20322343233582. Its totient is φ = 20322343233580.

The previous prime is 20322343233571. The next prime is 20322343233583. The reversal of 20322343233581 is 18533234322302.

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., 17145272269225 + 3177070964356 = 4140685^2 + 1782434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20322343233581 is a prime.

It is a super-2 number, since 2×20322343233581² (a number of 27 digits) contains 22 as substring.

Together with 20322343233583, 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 (20322343233583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161171616790 + 10161171616791.

It is an arithmetic number, because the mean of its divisors is an integer number (10161171616791).

Almost surely, 2^{20322343233581} is an apocalyptic number.

It is an amenable number.

20322343233581 is a deficient number, since it is larger than the sum of its proper divisors (1).

20322343233581 is an equidigital number, since it uses as much as digits as its factorization.

20322343233581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 622080, while the sum is 41.

Adding to 20322343233581 its reverse (18533234322302), we get a palindrome (38855577555883).

The spelling of 20322343233581 in words is "twenty trillion, three hundred twenty-two billion, three hundred forty-three million, two hundred thirty-three thousand, five hundred eighty-one".