20728285563 has 16 divisors (see below), whose sum is σ = 28608768000. Its totient is φ = 13335815040.

The previous prime is 20728285553. The next prime is 20728285577. The reversal of 20728285563 is 36558282702.

It is not a de Polignac number, because 20728285563 - 2²⁰ = 20727236987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20728285553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277038 + ... + 343811.

It is an arithmetic number, because the mean of its divisors is an integer number (1788048000).

Almost surely, 2^20728285563 is an apocalyptic number.

20728285563 is a deficient number, since it is larger than the sum of its proper divisors (7880482437).

20728285563 is a wasteful number, since it uses less digits than its factorization.

20728285563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621242.

The product of its (nonzero) digits is 1612800, while the sum is 48.

The spelling of 20728285563 in words is "twenty billion, seven hundred twenty-eight million, two hundred eighty-five thousand, five hundred sixty-three".