20647308932791 has 2 divisors, whose sum is σ = 20647308932792. Its totient is φ = 20647308932790.

The previous prime is 20647308932753. The next prime is 20647308932801. The reversal of 20647308932791 is 19723980374602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20647308932791 - 2²⁹ = 20646772061879 is a prime.

It is a super-2 number, since 2×20647308932791² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20647308933791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10323654466395 + 10323654466396.

It is an arithmetic number, because the mean of its divisors is an integer number (10323654466396).

Almost surely, 2^{20647308932791} is an apocalyptic number.

20647308932791 is a deficient number, since it is larger than the sum of its proper divisors (1).

20647308932791 is an equidigital number, since it uses as much as digits as its factorization.

20647308932791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27433728, while the sum is 61.

The spelling of 20647308932791 in words is "twenty trillion, six hundred forty-seven billion, three hundred eight million, nine hundred thirty-two thousand, seven hundred ninety-one".