20806553818 has 8 divisors (see below), whose sum is σ = 31501511712. Its totient is φ = 10306049916.

The previous prime is 20806553813. The next prime is 20806553851. The reversal of 20806553818 is 81835560802.

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

It is not an unprimeable number, because it can be changed into a prime (20806553813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48613230 + ... + 48613657.

It is an arithmetic number, because the mean of its divisors is an integer number (3937688964).

Almost surely, 2^20806553818 is an apocalyptic number.

20806553818 is a deficient number, since it is larger than the sum of its proper divisors (10694957894).

20806553818 is a wasteful number, since it uses less digits than its factorization.

20806553818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97226996.

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 20806553818 in words is "twenty billion, eight hundred six million, five hundred fifty-three thousand, eight hundred eighteen".