20773205135537 has 4 divisors (see below), whose sum is σ = 20773459999860. Its totient is φ = 20772950271216.

The previous prime is 20773205135513. The next prime is 20773205135567. The reversal of 20773205135537 is 73553150237702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9814880702641 + 10958324432896 = 3132871^2 + 3310336^2 .

It is a cyclic number.

It is not a de Polignac number, because 20773205135537 - 2⁸ = 20773205135281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20773205135567) 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 in 3 ways as a sum of consecutive naturals, for example, 127309862 + ... + 127472927.

It is an arithmetic number, because the mean of its divisors is an integer number (5193364999965).

Almost surely, 2^{20773205135537} is an apocalyptic number.

It is an amenable number.

20773205135537 is a deficient number, since it is larger than the sum of its proper divisors (254864323).

20773205135537 is an equidigital number, since it uses as much as digits as its factorization.

20773205135537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254864322.

The product of its (nonzero) digits is 4630500, while the sum is 50.

The spelling of 20773205135537 in words is "twenty trillion, seven hundred seventy-three billion, two hundred five million, one hundred thirty-five thousand, five hundred thirty-seven".