18336641220 has 144 divisors (see below), whose sum is σ = 60208485120. Its totient is φ = 4632365376.

The previous prime is 18336641129. The next prime is 18336641221. The reversal of 18336641220 is 2214663381.

18336641220 is a `hidden beast` number, since 1 + 8 + 3 + 3 + 6 + 641 + 2 + 2 + 0 = 666.

It is a super-2 number, since 2×18336641220² (a number of 21 digits) contains 22 as substring.

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 (18336641221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 147909 + ... + 241971.

It is an arithmetic number, because the mean of its divisors is an integer number (418114480).

Almost surely, 2^18336641220 is an apocalyptic number.

18336641220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18336641220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30104242560).

18336641220 is an abundant number, since it is smaller than the sum of its proper divisors (41871843900).

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

18336641220 is a wasteful number, since it uses less digits than its factorization.

18336641220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94119 (or 94092 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 18336641220 in words is "eighteen billion, three hundred thirty-six million, six hundred forty-one thousand, two hundred twenty".