20656775353 has 4 divisors (see below), whose sum is σ = 20663025040. Its totient is φ = 20650525668.

The previous prime is 20656775333. The next prime is 20656775369. The reversal of 20656775353 is 35357765602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20656775353 - 2⁹ = 20656774841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20656775297 and 20656775306.

It is not an unprimeable number, because it can be changed into a prime (20656775333) 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, 3119883 + ... + 3126496.

It is an arithmetic number, because the mean of its divisors is an integer number (5165756260).

Almost surely, 2^20656775353 is an apocalyptic number.

It is an amenable number.

20656775353 is a deficient number, since it is larger than the sum of its proper divisors (6249687).

20656775353 is an equidigital number, since it uses as much as digits as its factorization.

20656775353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6249686.

The product of its (nonzero) digits is 3969000, while the sum is 49.

The spelling of 20656775353 in words is "twenty billion, six hundred fifty-six million, seven hundred seventy-five thousand, three hundred fifty-three".