20647045933 has 2 divisors, whose sum is σ = 20647045934. Its totient is φ = 20647045932.

The previous prime is 20647045931. The next prime is 20647045963. The reversal of 20647045933 is 33954074602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12673806084 + 7973239849 = 112578^2 + 89293^2 .

It is a cyclic number.

It is not a de Polignac number, because 20647045933 - 2¹ = 20647045931 is a prime.

Together with 20647045931, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20647045933.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20647045931) 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, 10323522966 + 10323522967.

It is an arithmetic number, because the mean of its divisors is an integer number (10323522967).

Almost surely, 2^20647045933 is an apocalyptic number.

It is an amenable number.

20647045933 is a deficient number, since it is larger than the sum of its proper divisors (1).

20647045933 is an equidigital number, since it uses as much as digits as its factorization.

20647045933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 43.

The spelling of 20647045933 in words is "twenty billion, six hundred forty-seven million, forty-five thousand, nine hundred thirty-three".