20338677187 has 2 divisors, whose sum is σ = 20338677188. Its totient is φ = 20338677186.

The previous prime is 20338677181. The next prime is 20338677197. The reversal of 20338677187 is 78177683302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20338677187 - 2¹⁹ = 20338152899 is a prime.

It is not a weakly prime, because it can be changed into another prime (20338677181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10169338593 + 10169338594.

It is an arithmetic number, because the mean of its divisors is an integer number (10169338594).

Almost surely, 2^20338677187 is an apocalyptic number.

20338677187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20338677187 is an equidigital number, since it uses as much as digits as its factorization.

20338677187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2370816, while the sum is 52.

The spelling of 20338677187 in words is "twenty billion, three hundred thirty-eight million, six hundred seventy-seven thousand, one hundred eighty-seven".