20716563 has 12 divisors (see below), whose sum is σ = 32132040. Its totient is φ = 11837952.

The previous prime is 20716561. The next prime is 20716573. The reversal of 20716563 is 36561702.

It is not a de Polignac number, because 20716563 - 2¹ = 20716561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20716563.

It is not an unprimeable number, because it can be changed into a prime (20716561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70318 + ... + 70611.

It is an arithmetic number, because the mean of its divisors is an integer number (2677670).

Almost surely, 2^20716563 is an apocalyptic number.

20716563 is a deficient number, since it is larger than the sum of its proper divisors (11415477).

20716563 is a wasteful number, since it uses less digits than its factorization.

20716563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140946 (or 140939 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 20716563 is about 4551.5451222634. The cubic root of 20716563 is about 274.6455510587.

The spelling of 20716563 in words is "twenty million, seven hundred sixteen thousand, five hundred sixty-three".