20310232181 has 2 divisors, whose sum is σ = 20310232182. Its totient is φ = 20310232180.

The previous prime is 20310232169. The next prime is 20310232249. The reversal of 20310232181 is 18123201302.

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., 18703024081 + 1607208100 = 136759^2 + 40090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20310232181 is a prime.

It is a super-2 number, since 2×20310232181² (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 (20310232121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10155116090 + 10155116091.

It is an arithmetic number, because the mean of its divisors is an integer number (10155116091).

Almost surely, 2^20310232181 is an apocalyptic number.

It is an amenable number.

20310232181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20310232181 is an equidigital number, since it uses as much as digits as its factorization.

20310232181 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 20310232181 its reverse (18123201302), we get a palindrome (38433433483).

The spelling of 20310232181 in words is "twenty billion, three hundred ten million, two hundred thirty-two thousand, one hundred eighty-one".