20773105649 has 2 divisors, whose sum is σ = 20773105650. Its totient is φ = 20773105648.

The previous prime is 20773105621. The next prime is 20773105667. The reversal of 20773105649 is 94650137702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20232217600 + 540888049 = 142240^2 + 23257^2 .

It is a cyclic number.

It is not a de Polignac number, because 20773105649 - 2²⁰ = 20772057073 is a prime.

It is a super-2 number, since 2×20773105649² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20773105679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10386552824 + 10386552825.

It is an arithmetic number, because the mean of its divisors is an integer number (10386552825).

Almost surely, 2^20773105649 is an apocalyptic number.

It is an amenable number.

20773105649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20773105649 is an equidigital number, since it uses as much as digits as its factorization.

20773105649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 20773105649 in words is "twenty billion, seven hundred seventy-three million, one hundred five thousand, six hundred forty-nine".