20955289177 has 8 divisors (see below), whose sum is σ = 21057389640. Its totient is φ = 20853281280.

The previous prime is 20955289153. The next prime is 20955289189. The reversal of 20955289177 is 77198255902.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6344281801 + 14611007376 = 79651^2 + 120876^2 .

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 20955289177 - 2⁷ = 20955289049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20955289877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454563 + ... + 498535.

It is an arithmetic number, because the mean of its divisors is an integer number (2632173705).

Almost surely, 2^20955289177 is an apocalyptic number.

It is an amenable number.

20955289177 is a deficient number, since it is larger than the sum of its proper divisors (102100463).

20955289177 is a wasteful number, since it uses less digits than its factorization.

20955289177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46283.

The product of its (nonzero) digits is 3175200, while the sum is 55.

The spelling of 20955289177 in words is "twenty billion, nine hundred fifty-five million, two hundred eighty-nine thousand, one hundred seventy-seven".