20023213181 has 2 divisors, whose sum is σ = 20023213182. Its totient is φ = 20023213180.

The previous prime is 20023213159. The next prime is 20023213219. The reversal of 20023213181 is 18131232002.

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., 18634980100 + 1388233081 = 136510^2 + 37259^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023213181 - 2²⁶ = 19956104317 is a prime.

It is a super-2 number, since 2×20023213181² (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 (20023213381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011606590 + 10011606591.

It is an arithmetic number, because the mean of its divisors is an integer number (10011606591).

Almost surely, 2^20023213181 is an apocalyptic number.

It is an amenable number.

20023213181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023213181 is an equidigital number, since it uses as much as digits as its factorization.

20023213181 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 20023213181 its reverse (18131232002), we get a palindrome (38154445183).

The spelling of 20023213181 in words is "twenty billion, twenty-three million, two hundred thirteen thousand, one hundred eighty-one".