20648347856 has 40 divisors (see below), whose sum is σ = 40681845600. Its totient is φ = 10151256960.

The previous prime is 20648347829. The next prime is 20648347859. The reversal of 20648347856 is 65874384602.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20648347798 and 20648347807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20648347859) 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 7 ways as a sum of consecutive naturals, for example, 183275 + ... + 273653.

It is an arithmetic number, because the mean of its divisors is an integer number (1017046140).

Almost surely, 2^20648347856 is an apocalyptic number.

It is an amenable number.

20648347856 is a deficient number, since it is larger than the sum of its proper divisors (20033497744).

20648347856 is a wasteful number, since it uses less digits than its factorization.

20648347856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90627 (or 90621 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 53.

The spelling of 20648347856 in words is "twenty billion, six hundred forty-eight million, three hundred forty-seven thousand, eight hundred fifty-six".