20109934687 has 2 divisors, whose sum is σ = 20109934688. Its totient is φ = 20109934686.

The previous prime is 20109934619. The next prime is 20109934699. The reversal of 20109934687 is 78643990102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20109934687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20109934687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20109934387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10054967343 + 10054967344.

It is an arithmetic number, because the mean of its divisors is an integer number (10054967344).

Almost surely, 2^20109934687 is an apocalyptic number.

20109934687 is a deficient number, since it is larger than the sum of its proper divisors (1).

20109934687 is an equidigital number, since it uses as much as digits as its factorization.

20109934687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 20109934687 in words is "twenty billion, one hundred nine million, nine hundred thirty-four thousand, six hundred eighty-seven".