20673248977 has 4 divisors (see below), whose sum is σ = 20792747700. Its totient is φ = 20553750256.

The previous prime is 20673248971. The next prime is 20673249001. The reversal of 20673248977 is 77984237602.

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 14724366336 + 5948882641 = 121344^2 + 77129^2 .

It is a cyclic number.

It is not a de Polignac number, because 20673248977 - 2¹⁹ = 20672724689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20673248971) 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 3 ways as a sum of consecutive naturals, for example, 59749102 + ... + 59749447.

It is an arithmetic number, because the mean of its divisors is an integer number (5198186925).

Almost surely, 2^20673248977 is an apocalyptic number.

It is an amenable number.

20673248977 is a deficient number, since it is larger than the sum of its proper divisors (119498723).

20673248977 is a wasteful number, since it uses less digits than its factorization.

20673248977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119498722.

The product of its (nonzero) digits is 7112448, while the sum is 55.

The spelling of 20673248977 in words is "twenty billion, six hundred seventy-three million, two hundred forty-eight thousand, nine hundred seventy-seven".