20741971867 has 2 divisors, whose sum is σ = 20741971868. Its totient is φ = 20741971866.

The previous prime is 20741971787. The next prime is 20741971903. The reversal of 20741971867 is 76817914702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20741971867 - 2⁷ = 20741971739 is a prime.

It is not a weakly prime, because it can be changed into another prime (20741971267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10370985933 + 10370985934.

It is an arithmetic number, because the mean of its divisors is an integer number (10370985934).

Almost surely, 2^20741971867 is an apocalyptic number.

20741971867 is a deficient number, since it is larger than the sum of its proper divisors (1).

20741971867 is an equidigital number, since it uses as much as digits as its factorization.

20741971867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The spelling of 20741971867 in words is "twenty billion, seven hundred forty-one million, nine hundred seventy-one thousand, eight hundred sixty-seven".