20418168213 has 6 divisors (see below), whose sum is σ = 29492909654. Its totient is φ = 13612112136.

The previous prime is 20418168191. The next prime is 20418168293. The reversal of 20418168213 is 31286181402.

20418168213 is a `hidden beast` number, since 20 + 418 + 1 + 6 + 8 + 213 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19526429169 + 891739044 = 139737^2 + 29862^2 .

It is not a de Polignac number, because 20418168213 - 2²¹ = 20416071061 is a prime.

It is a super-2 number, since 2×20418168213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20418168293) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1134342670 + ... + 1134342687.

Almost surely, 2^20418168213 is an apocalyptic number.

It is an amenable number.

20418168213 is a deficient number, since it is larger than the sum of its proper divisors (9074741441).

20418168213 is a wasteful number, since it uses less digits than its factorization.

20418168213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2268685363 (or 2268685360 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The spelling of 20418168213 in words is "twenty billion, four hundred eighteen million, one hundred sixty-eight thousand, two hundred thirteen".