20206665563 has 8 divisors (see below), whose sum is σ = 23484744960. Its totient is φ = 17026439400.

The previous prime is 20206665529. The next prime is 20206665599. The reversal of 20206665563 is 36556660202.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20206665563 - 2²⁶ = 20139556699 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20206665563.

It is not an unprimeable number, because it can be changed into a prime (20206665503) 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, 24462863 + ... + 24463688.

It is an arithmetic number, because the mean of its divisors is an integer number (2935593120).

Almost surely, 2^20206665563 is an apocalyptic number.

20206665563 is a deficient number, since it is larger than the sum of its proper divisors (3278079397).

20206665563 is an equidigital number, since it uses as much as digits as its factorization.

20206665563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48926617.

The product of its (nonzero) digits is 388800, while the sum is 41.

The spelling of 20206665563 in words is "twenty billion, two hundred six million, six hundred sixty-five thousand, five hundred sixty-three".