20338677181 has 2 divisors, whose sum is σ = 20338677182. Its totient is φ = 20338677180.

The previous prime is 20338677173. The next prime is 20338677187. The reversal of 20338677181 is 18177683302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12740765625 + 7597911556 = 112875^2 + 87166^2 .

It is a cyclic number.

It is not a de Polignac number, because 20338677181 - 2³ = 20338677173 is a prime.

It is a super-2 number, since 2×20338677181² (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 (20338677187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10169338590 + 10169338591.

It is an arithmetic number, because the mean of its divisors is an integer number (10169338591).

Almost surely, 2^20338677181 is an apocalyptic number.

It is an amenable number.

20338677181 is a deficient number, since it is larger than the sum of its proper divisors (1).

20338677181 is an equidigital number, since it uses as much as digits as its factorization.

20338677181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 20338677181 in words is "twenty billion, three hundred thirty-eight million, six hundred seventy-seven thousand, one hundred eighty-one".