20547320771 has 2 divisors, whose sum is σ = 20547320772. Its totient is φ = 20547320770.

The previous prime is 20547320749. The next prime is 20547320777. The reversal of 20547320771 is 17702374502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20547320771 - 2²² = 20543126467 is a prime.

It is not a weakly prime, because it can be changed into another prime (20547320777) 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, 10273660385 + 10273660386.

It is an arithmetic number, because the mean of its divisors is an integer number (10273660386).

Almost surely, 2^20547320771 is an apocalyptic number.

20547320771 is a deficient number, since it is larger than the sum of its proper divisors (1).

20547320771 is an equidigital number, since it uses as much as digits as its factorization.

20547320771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82320, while the sum is 38.

The spelling of 20547320771 in words is "twenty billion, five hundred forty-seven million, three hundred twenty thousand, seven hundred seventy-one".