20323012181 has 2 divisors, whose sum is σ = 20323012182. Its totient is φ = 20323012180.

The previous prime is 20323012169. The next prime is 20323012231. The reversal of 20323012181 is 18121032302.

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., 19831680625 + 491331556 = 140825^2 + 22166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20323012181 is a prime.

It is a super-2 number, since 2×20323012181² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20323012141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10161506090 + 10161506091.

It is an arithmetic number, because the mean of its divisors is an integer number (10161506091).

Almost surely, 2^20323012181 is an apocalyptic number.

It is an amenable number.

20323012181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20323012181 is an equidigital number, since it uses as much as digits as its factorization.

20323012181 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 20323012181 its reverse (18121032302), we get a palindrome (38444044483).

The spelling of 20323012181 in words is "twenty billion, three hundred twenty-three million, twelve thousand, one hundred eighty-one".