20736129939671 has 2 divisors, whose sum is σ = 20736129939672. Its totient is φ = 20736129939670.

The previous prime is 20736129939641. The next prime is 20736129939787. The reversal of 20736129939671 is 17693992163702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20736129939671 - 2¹⁴ = 20736129923287 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20736129939598 and 20736129939607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20736129939611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10368064969835 + 10368064969836.

It is an arithmetic number, because the mean of its divisors is an integer number (10368064969836).

Almost surely, 2^{20736129939671} is an apocalyptic number.

20736129939671 is a deficient number, since it is larger than the sum of its proper divisors (1).

20736129939671 is an equidigital number, since it uses as much as digits as its factorization.

20736129939671 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46294416, while the sum is 65.

The spelling of 20736129939671 in words is "twenty trillion, seven hundred thirty-six billion, one hundred twenty-nine million, nine hundred thirty-nine thousand, six hundred seventy-one".