20565300018 has 16 divisors (see below), whose sum is σ = 41132282400. Its totient is φ = 6854819616.

The previous prime is 20565299983. The next prime is 20565300029. The reversal of 20565300018 is 81000356502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134958 + ... + 243606.

It is an arithmetic number, because the mean of its divisors is an integer number (2570767650).

Almost surely, 2^20565300018 is an apocalyptic number.

20565300018 is an abundant number, since it is smaller than the sum of its proper divisors (20566982382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20565300018 is a wasteful number, since it uses less digits than its factorization.

20565300018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140201.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 20565300018 in words is "twenty billion, five hundred sixty-five million, three hundred thousand, eighteen".