20803620638563 has 8 divisors (see below), whose sum is σ = 23808270117632. Its totient is φ = 17807147077896.

The previous prime is 20803620638543. The next prime is 20803620638609. The reversal of 20803620638563 is 36583602630802.

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 20803620638563 - 2¹³ = 20803620630371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20803620638563.

It is not an unprimeable number, because it can be changed into a prime (20803620638533) 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, 2043974145 + ... + 2043984322.

It is an arithmetic number, because the mean of its divisors is an integer number (2976033764704).

Almost surely, 2^{20803620638563} is an apocalyptic number.

20803620638563 is a deficient number, since it is larger than the sum of its proper divisors (3004649479069).

20803620638563 is an equidigital number, since it uses as much as digits as its factorization.

20803620638563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4087959201.

The product of its (nonzero) digits is 7464960, while the sum is 52.

The spelling of 20803620638563 in words is "twenty trillion, eight hundred three billion, six hundred twenty million, six hundred thirty-eight thousand, five hundred sixty-three".