20309841187 has 2 divisors, whose sum is σ = 20309841188. Its totient is φ = 20309841186.

The previous prime is 20309841173. The next prime is 20309841193. The reversal of 20309841187 is 78114890302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20309841187 - 2⁷ = 20309841059 is a prime.

It is not a weakly prime, because it can be changed into another prime (20309841107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10154920593 + 10154920594.

It is an arithmetic number, because the mean of its divisors is an integer number (10154920594).

Almost surely, 2^20309841187 is an apocalyptic number.

20309841187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20309841187 is an equidigital number, since it uses as much as digits as its factorization.

20309841187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The spelling of 20309841187 in words is "twenty billion, three hundred nine million, eight hundred forty-one thousand, one hundred eighty-seven".