20858731871 has 2 divisors, whose sum is σ = 20858731872. Its totient is φ = 20858731870.

The previous prime is 20858731853. The next prime is 20858731913. The reversal of 20858731871 is 17813785802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20858731871 - 2¹⁴ = 20858715487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20858731801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429365935 + 10429365936.

It is an arithmetic number, because the mean of its divisors is an integer number (10429365936).

Almost surely, 2^20858731871 is an apocalyptic number.

20858731871 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858731871 is an equidigital number, since it uses as much as digits as its factorization.

20858731871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 752640, while the sum is 50.

The spelling of 20858731871 in words is "twenty billion, eight hundred fifty-eight million, seven hundred thirty-one thousand, eight hundred seventy-one".