20085379777 has 4 divisors (see below), whose sum is σ = 20085942996. Its totient is φ = 20084816560.

The previous prime is 20085379771. The next prime is 20085379799. The reversal of 20085379777 is 77797358002.

It is a happy number.

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 9924941376 + 10160438401 = 99624^2 + 100799^2 .

It is a cyclic number.

It is not a de Polignac number, because 20085379777 - 2⁷ = 20085379649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20085379771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224218 + ... + 300739.

It is an arithmetic number, because the mean of its divisors is an integer number (5021485749).

Almost surely, 2^20085379777 is an apocalyptic number.

It is an amenable number.

20085379777 is a deficient number, since it is larger than the sum of its proper divisors (563219).

20085379777 is an equidigital number, since it uses as much as digits as its factorization.

20085379777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563218.

The product of its (nonzero) digits is 5186160, while the sum is 55.

The spelling of 20085379777 in words is "twenty billion, eighty-five million, three hundred seventy-nine thousand, seven hundred seventy-seven".