20101978927 has 2 divisors, whose sum is σ = 20101978928. Its totient is φ = 20101978926.

The previous prime is 20101978921. The next prime is 20101978943. The reversal of 20101978927 is 72987910102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20101978927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101978921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050989463 + 10050989464.

It is an arithmetic number, because the mean of its divisors is an integer number (10050989464).

Almost surely, 2^20101978927 is an apocalyptic number.

20101978927 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101978927 is an equidigital number, since it uses as much as digits as its factorization.

20101978927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 46.

The spelling of 20101978927 in words is "twenty billion, one hundred one million, nine hundred seventy-eight thousand, nine hundred twenty-seven".