20773147805 has 8 divisors (see below), whose sum is σ = 25398113112. Its totient is φ = 16304961088.

The previous prime is 20773147793. The next prime is 20773147819. The reversal of 20773147805 is 50874137702.

It can be written as a sum of positive squares in 4 ways, for example, as 1387041049 + 19386106756 = 37243^2 + 139234^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20773147805 - 2⁶ = 20773147741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39194354 + ... + 39194883.

It is an arithmetic number, because the mean of its divisors is an integer number (3174764139).

Almost surely, 2^20773147805 is an apocalyptic number.

It is an amenable number.

20773147805 is a deficient number, since it is larger than the sum of its proper divisors (4624965307).

20773147805 is an equidigital number, since it uses as much as digits as its factorization.

20773147805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78389295.

The product of its (nonzero) digits is 329280, while the sum is 44.

The spelling of 20773147805 in words is "twenty billion, seven hundred seventy-three million, one hundred forty-seven thousand, eight hundred five".