20565355318 has 32 divisors (see below), whose sum is σ = 33463715040. Its totient is φ = 9445662720.

The previous prime is 20565355303. The next prime is 20565355319. The reversal of 20565355318 is 81355356502.

It is a super-2 number, since 2×20565355318² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20565355319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 386998 + ... + 436918.

It is an arithmetic number, because the mean of its divisors is an integer number (1045741095).

Almost surely, 2^20565355318 is an apocalyptic number.

20565355318 is a deficient number, since it is larger than the sum of its proper divisors (12898359722).

20565355318 is a wasteful number, since it uses less digits than its factorization.

20565355318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50272.

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 20565355318 in words is "twenty billion, five hundred sixty-five million, three hundred fifty-five thousand, three hundred eighteen".