20855656177 has 8 divisors (see below), whose sum is σ = 21115127880. Its totient is φ = 20597498880.

The previous prime is 20855656169. The next prime is 20855656189. The reversal of 20855656177 is 77165655802.

It can be written as a sum of positive squares in 4 ways, for example, as 149597361 + 20706058816 = 12231^2 + 143896^2 .

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 20855656177 - 2³ = 20855656169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20855656777) by changing a digit.

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, 296652 + ... + 360157.

It is an arithmetic number, because the mean of its divisors is an integer number (2639390985).

Almost surely, 2^20855656177 is an apocalyptic number.

It is an amenable number.

20855656177 is a deficient number, since it is larger than the sum of its proper divisors (259471703).

20855656177 is a wasteful number, since it uses less digits than its factorization.

20855656177 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657203.

The product of its (nonzero) digits is 3528000, while the sum is 52.

The spelling of 20855656177 in words is "twenty billion, eight hundred fifty-five million, six hundred fifty-six thousand, one hundred seventy-seven".