20648873953 has 4 divisors (see below), whose sum is σ = 21129080368. Its totient is φ = 20168667540.

The previous prime is 20648873939. The next prime is 20648873957. The reversal of 20648873953 is 35937884602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-20648873953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20648873894 and 20648873903.

It is not an unprimeable number, because it can be changed into a prime (20648873957) 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, 240103143 + ... + 240103228.

It is an arithmetic number, because the mean of its divisors is an integer number (5282270092).

Almost surely, 2^20648873953 is an apocalyptic number.

It is an amenable number.

20648873953 is a deficient number, since it is larger than the sum of its proper divisors (480206415).

20648873953 is an equidigital number, since it uses as much as digits as its factorization.

20648873953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480206414.

The product of its (nonzero) digits is 8709120, while the sum is 55.

The spelling of 20648873953 in words is "twenty billion, six hundred forty-eight million, eight hundred seventy-three thousand, nine hundred fifty-three".