18209752020 has 192 divisors, whose sum is σ = 58306348800. Its totient is φ = 4714744320.

The previous prime is 18209752003. The next prime is 18209752037. The reversal of 18209752020 is 2025790281.

18209752020 is a `hidden beast` number, since 1 + 8 + 20 + 97 + 520 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (18209752003) and next prime (18209752037).

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

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 17162290 + ... + 17163350.

It is an arithmetic number, because the mean of its divisors is an integer number (303678900).

Almost surely, 2^18209752020 is an apocalyptic number.

18209752020 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 18209752020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29153174400).

18209752020 is an abundant number, since it is smaller than the sum of its proper divisors (40096596780).

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

18209752020 is a wasteful number, since it uses less digits than its factorization.

18209752020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975 (or 1967 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 18209752020 in words is "eighteen billion, two hundred nine million, seven hundred fifty-two thousand, twenty".