20023332181 has 2 divisors, whose sum is σ = 20023332182. Its totient is φ = 20023332180.

The previous prime is 20023332011. The next prime is 20023332187. The reversal of 20023332181 is 18123332002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14218416081 + 5804916100 = 119241^2 + 76190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023332181 - 2¹⁷ = 20023201109 is a prime.

It is a super-2 number, since 2×20023332181² (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 (20023332187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011666090 + 10011666091.

It is an arithmetic number, because the mean of its divisors is an integer number (10011666091).

Almost surely, 2^20023332181 is an apocalyptic number.

It is an amenable number.

20023332181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023332181 is an equidigital number, since it uses as much as digits as its factorization.

20023332181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 20023332181 its reverse (18123332002), we get a palindrome (38146664183).

The spelling of 20023332181 in words is "twenty billion, twenty-three million, three hundred thirty-two thousand, one hundred eighty-one".