20748351648 has 48 divisors (see below), whose sum is σ = 54519302880. Its totient is φ = 6909148416.

The previous prime is 20748351647. The next prime is 20748351653. The reversal of 20748351648 is 84615384702.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×20748351648² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 20748351597 and 20748351606.

It is not an unprimeable number, because it can be changed into a prime (20748351647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12678 + ... + 204101.

It is an arithmetic number, because the mean of its divisors is an integer number (1135818810).

Almost surely, 2^20748351648 is an apocalyptic number.

It is an amenable number.

20748351648 is an abundant number, since it is smaller than the sum of its proper divisors (33770951232).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20748351648 is a wasteful number, since it uses less digits than its factorization.

20748351648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217789 (or 217781 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 48.

The spelling of 20748351648 in words is "twenty billion, seven hundred forty-eight million, three hundred fifty-one thousand, six hundred forty-eight".