20387871671 has 2 divisors, whose sum is σ = 20387871672. Its totient is φ = 20387871670.

The previous prime is 20387871667. The next prime is 20387871697. The reversal of 20387871671 is 17617878302.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20387871671 - 2² = 20387871667 is a prime.

It is a super-2 number, since 2×20387871671² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20387871661) 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, 10193935835 + 10193935836.

It is an arithmetic number, because the mean of its divisors is an integer number (10193935836).

Almost surely, 2^20387871671 is an apocalyptic number.

20387871671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20387871671 is an equidigital number, since it uses as much as digits as its factorization.

20387871671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 20387871671 in words is "twenty billion, three hundred eighty-seven million, eight hundred seventy-one thousand, six hundred seventy-one".