20777373845 has 16 divisors (see below), whose sum is σ = 25197936192. Its totient is φ = 16445694720.

The previous prime is 20777373839. The next prime is 20777373847. The reversal of 20777373845 is 54837377702.

It is not a de Polignac number, because 20777373845 - 2²⁴ = 20760596629 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 (20777373847) 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 15 ways as a sum of consecutive naturals, for example, 290414 + ... + 354816.

It is an arithmetic number, because the mean of its divisors is an integer number (1574871012).

Almost surely, 2^20777373845 is an apocalyptic number.

It is an amenable number.

20777373845 is a deficient number, since it is larger than the sum of its proper divisors (4420562347).

20777373845 is a wasteful number, since it uses less digits than its factorization.

20777373845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65092.

The product of its (nonzero) digits is 6914880, while the sum is 53.

The spelling of 20777373845 in words is "twenty billion, seven hundred seventy-seven million, three hundred seventy-three thousand, eight hundred forty-five".