20978094073 has 2 divisors, whose sum is σ = 20978094074. Its totient is φ = 20978094072.

The previous prime is 20978094031. The next prime is 20978094077. The reversal of 20978094073 is 37049087902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15057253264 + 5920840809 = 122708^2 + 76947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20978094073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20978094077) 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, 10489047036 + 10489047037.

It is an arithmetic number, because the mean of its divisors is an integer number (10489047037).

Almost surely, 2^20978094073 is an apocalyptic number.

It is an amenable number.

20978094073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20978094073 is an equidigital number, since it uses as much as digits as its factorization.

20978094073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 49.

The spelling of 20978094073 in words is "twenty billion, nine hundred seventy-eight million, ninety-four thousand, seventy-three".