20182218408 has 96 divisors (see below), whose sum is σ = 59671404000. Its totient is φ = 6111504000.

The previous prime is 20182218391. The next prime is 20182218409. The reversal of 20182218408 is 80481228102.

20182218408 is a `hidden beast` number, since 20 + 1 + 8 + 221 + 8 + 408 = 666.

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 (20182218409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1218583 + ... + 1235033.

It is an arithmetic number, because the mean of its divisors is an integer number (621577125).

Almost surely, 2^20182218408 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 20182218408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29835702000).

20182218408 is an abundant number, since it is smaller than the sum of its proper divisors (39489185592).

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

20182218408 is a wasteful number, since it uses less digits than its factorization.

20182218408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18023 (or 18016 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

The spelling of 20182218408 in words is "twenty billion, one hundred eighty-two million, two hundred eighteen thousand, four hundred eight".