20978711333 has 2 divisors, whose sum is σ = 20978711334. Its totient is φ = 20978711332.

The previous prime is 20978711329. The next prime is 20978711431. The reversal of 20978711333 is 33311787902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18251469604 + 2727241729 = 135098^2 + 52223^2 .

It is a cyclic number.

It is not a de Polignac number, because 20978711333 - 2² = 20978711329 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20978711233) 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, 10489355666 + 10489355667.

It is an arithmetic number, because the mean of its divisors is an integer number (10489355667).

Almost surely, 2^20978711333 is an apocalyptic number.

It is an amenable number.

20978711333 is a deficient number, since it is larger than the sum of its proper divisors (1).

20978711333 is an equidigital number, since it uses as much as digits as its factorization.

20978711333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 44.

The spelling of 20978711333 in words is "twenty billion, nine hundred seventy-eight million, seven hundred eleven thousand, three hundred thirty-three".