20997906047999 has 2 divisors, whose sum is σ = 20997906048000. Its totient is φ = 20997906047998.

The previous prime is 20997906047933. The next prime is 20997906048089. The reversal of 20997906047999 is 99974060979902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20997906047999 - 2⁸ = 20997906047743 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 (20997906047299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10498953023999 + 10498953024000.

It is an arithmetic number, because the mean of its divisors is an integer number (10498953024000).

Almost surely, 2^{20997906047999} is an apocalyptic number.

20997906047999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20997906047999 is an equidigital number, since it uses as much as digits as its factorization.

20997906047999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1249949232, while the sum is 80.

The spelling of 20997906047999 in words is "twenty trillion, nine hundred ninety-seven billion, nine hundred six million, forty-seven thousand, nine hundred ninety-nine".