20350320181 has 2 divisors, whose sum is σ = 20350320182. Its totient is φ = 20350320180.

The previous prime is 20350320119. The next prime is 20350320247. The reversal of 20350320181 is 18102305302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11665944081 + 8684376100 = 108009^2 + 93190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20350320181 - 2¹¹ = 20350318133 is a prime.

It is a super-2 number, since 2×20350320181² (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 (20350320281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10175160090 + 10175160091.

It is an arithmetic number, because the mean of its divisors is an integer number (10175160091).

Almost surely, 2^20350320181 is an apocalyptic number.

It is an amenable number.

20350320181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20350320181 is an equidigital number, since it uses as much as digits as its factorization.

20350320181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 20350320181 its reverse (18102305302), we get a palindrome (38452625483).

The spelling of 20350320181 in words is "twenty billion, three hundred fifty million, three hundred twenty thousand, one hundred eighty-one".