18220408340 has 48 divisors (see below), whose sum is σ = 40426646400. Its totient is φ = 6878869632.

The previous prime is 18220408163. The next prime is 18220408343. The reversal of 18220408340 is 4380402281.

It is a junction number, because it is equal to n+sod(n) for n = 18220408297 and 18220408306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220408343) 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, 13097 + ... + 191343.

It is an arithmetic number, because the mean of its divisors is an integer number (842221800).

Almost surely, 2^18220408340 is an apocalyptic number.

18220408340 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 18220408340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20213323200).

18220408340 is an abundant number, since it is smaller than the sum of its proper divisors (22206238060).

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

18220408340 is a wasteful number, since it uses less digits than its factorization.

18220408340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178544 (or 178542 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 32.

The spelling of 18220408340 in words is "eighteen billion, two hundred twenty million, four hundred eight thousand, three hundred forty".