20648848109 has 4 divisors (see below), whose sum is σ = 20931709116. Its totient is φ = 20365987104.

The previous prime is 20648848093. The next prime is 20648848133. The reversal of 20648848109 is 90184884602.

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 5178961225 + 15469886884 = 71965^2 + 124378^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648848109 - 2⁴ = 20648848093 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 (20648848309) 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, 141430394 + ... + 141430539.

It is an arithmetic number, because the mean of its divisors is an integer number (5232927279).

Almost surely, 2^20648848109 is an apocalyptic number.

It is an amenable number.

20648848109 is a deficient number, since it is larger than the sum of its proper divisors (282861007).

20648848109 is an equidigital number, since it uses as much as digits as its factorization.

20648848109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282861006.

The product of its (nonzero) digits is 884736, while the sum is 50.

The spelling of 20648848109 in words is "twenty billion, six hundred forty-eight million, eight hundred forty-eight thousand, one hundred nine".