18220109335020 has 480 divisors, whose sum is σ = 62345826385920. Its totient is φ = 4440577489920.

The previous prime is 18220109335013. The next prime is 18220109335039. The reversal of 18220109335020 is 2053390102281.

18220109335020 is a `hidden beast` number, since 1 + 82 + 201 + 0 + 9 + 3 + 350 + 20 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 91149904 + ... + 91349576.

It is an arithmetic number, because the mean of its divisors is an integer number (129887138304).

Almost surely, 2^{18220109335020} is an apocalyptic number.

18220109335020 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 18220109335020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31172913192960).

18220109335020 is an abundant number, since it is smaller than the sum of its proper divisors (44125717050900).

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

18220109335020 is a wasteful number, since it uses less digits than its factorization.

18220109335020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199827 (or 199816 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 18220109335020 in words is "eighteen trillion, two hundred twenty billion, one hundred nine million, three hundred thirty-five thousand, twenty".