20402184168 has 96 divisors (see below), whose sum is σ = 58555715400. Its totient is φ = 6406041600.

The previous prime is 20402184167. The next prime is 20402184191. The reversal of 20402184168 is 86148120402.

20402184168 is a `hidden beast` number, since 20 + 4 + 0 + 218 + 416 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 16491182724 + 3911001444 = 128418^2 + 62538^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20402184167) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33553 + ... + 204768.

Almost surely, 2^20402184168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20402184168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29277857700).

20402184168 is an abundant number, since it is smaller than the sum of its proper divisors (38153531232).

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

20402184168 is a wasteful number, since it uses less digits than its factorization.

20402184168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238403 (or 238396 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The spelling of 20402184168 in words is "twenty billion, four hundred two million, one hundred eighty-four thousand, one hundred sixty-eight".