20632720291 has 2 divisors, whose sum is σ = 20632720292. Its totient is φ = 20632720290.

The previous prime is 20632720289. The next prime is 20632720379. The reversal of 20632720291 is 19202723602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20632720291 - 2¹ = 20632720289 is a prime.

Together with 20632720289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20632720201) 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, 10316360145 + 10316360146.

It is an arithmetic number, because the mean of its divisors is an integer number (10316360146).

Almost surely, 2^20632720291 is an apocalyptic number.

20632720291 is a deficient number, since it is larger than the sum of its proper divisors (1).

20632720291 is an equidigital number, since it uses as much as digits as its factorization.

20632720291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The spelling of 20632720291 in words is "twenty billion, six hundred thirty-two million, seven hundred twenty thousand, two hundred ninety-one".