20861052803 has 4 divisors (see below), whose sum is σ = 20927701848. Its totient is φ = 20794403760.

The previous prime is 20861052791. The next prime is 20861052811. The reversal of 20861052803 is 30825016802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20861052803 - 2¹⁰ = 20861051779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20861052833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33324053 + ... + 33324678.

It is an arithmetic number, because the mean of its divisors is an integer number (5231925462).

Almost surely, 2^20861052803 is an apocalyptic number.

20861052803 is a deficient number, since it is larger than the sum of its proper divisors (66649045).

20861052803 is an equidigital number, since it uses as much as digits as its factorization.

20861052803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66649044.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 20861052803 in words is "twenty billion, eight hundred sixty-one million, fifty-two thousand, eight hundred three".