18680189220 has 960 divisors, whose sum is σ = 80932110336. Its totient is φ = 3485306880.

The previous prime is 18680189201. The next prime is 18680189261. The reversal of 18680189220 is 2298108681.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 48773149 + ... + 48773531.

Almost surely, 2^18680189220 is an apocalyptic number.

18680189220 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 18680189220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40466055168).

18680189220 is an abundant number, since it is smaller than the sum of its proper divisors (62251921116).

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

18680189220 is a wasteful number, since it uses less digits than its factorization.

18680189220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 18680189220 in words is "eighteen billion, six hundred eighty million, one hundred eighty-nine thousand, two hundred twenty".