20380854677 has 4 divisors (see below), whose sum is σ = 20510669196. Its totient is φ = 20251040160.

The previous prime is 20380854647. The next prime is 20380854701. The reversal of 20380854677 is 77645808302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77645808302 = 2 ⋅38822904151.

It can be written as a sum of positive squares in 2 ways, for example, as 14248241956 + 6132612721 = 119366^2 + 78311^2 .

It is a cyclic number.

It is not a de Polignac number, because 20380854677 - 2¹⁴ = 20380838293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20380854647) 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, 64907024 + ... + 64907337.

It is an arithmetic number, because the mean of its divisors is an integer number (5127667299).

Almost surely, 2^20380854677 is an apocalyptic number.

It is an amenable number.

20380854677 is a deficient number, since it is larger than the sum of its proper divisors (129814519).

20380854677 is a wasteful number, since it uses less digits than its factorization.

20380854677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129814518.

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 20380854677 in words is "twenty billion, three hundred eighty million, eight hundred fifty-four thousand, six hundred seventy-seven".