20277300647 has 4 divisors (see below), whose sum is σ = 21470083056. Its totient is φ = 19084518240.

The previous prime is 20277300619. The next prime is 20277300649. The reversal of 20277300647 is 74600377202.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20277300647 - 2⁶ = 20277300583 is a prime.

It is a super-5 number, since 5×20277300647⁵ (a number of 53 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20277300647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20277300649) 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, 596391179 + ... + 596391212.

It is an arithmetic number, because the mean of its divisors is an integer number (5367520764).

Almost surely, 2^20277300647 is an apocalyptic number.

20277300647 is a deficient number, since it is larger than the sum of its proper divisors (1192782409).

20277300647 is a wasteful number, since it uses less digits than its factorization.

20277300647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1192782408.

The product of its (nonzero) digits is 98784, while the sum is 38.

Adding to 20277300647 its reverse (74600377202), we get a palindrome (94877677849).

The spelling of 20277300647 in words is "twenty billion, two hundred seventy-seven million, three hundred thousand, six hundred forty-seven".