20806455853 has 8 divisors (see below), whose sum is σ = 21570728256. Its totient is φ = 20054412000.

The previous prime is 20806455827. The next prime is 20806455869. The reversal of 20806455853 is 35855460802.

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

It is not a de Polignac number, because 20806455853 - 2⁵ = 20806455821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20806455893) 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, 3053673 + ... + 3060478.

It is an arithmetic number, because the mean of its divisors is an integer number (2696341032).

Almost surely, 2^20806455853 is an apocalyptic number.

It is an amenable number.

20806455853 is a deficient number, since it is larger than the sum of its proper divisors (764272403).

20806455853 is an equidigital number, since it uses as much as digits as its factorization.

20806455853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6114275.

The product of its (nonzero) digits is 1152000, while the sum is 46.

The spelling of 20806455853 in words is "twenty billion, eight hundred six million, four hundred fifty-five thousand, eight hundred fifty-three".