18704791980 has 144 divisors (see below), whose sum is σ = 65449762560. Its totient is φ = 4235393664.

The previous prime is 18704791967. The next prime is 18704792017. The reversal of 18704791980 is 8919740781.

18704791980 is a `hidden beast` number, since 1 + 87 + 0 + 479 + 1 + 98 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65451 + ... + 204189.

It is an arithmetic number, because the mean of its divisors is an integer number (454512240).

Almost surely, 2^18704791980 is an apocalyptic number.

18704791980 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 18704791980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32724881280).

18704791980 is an abundant number, since it is smaller than the sum of its proper divisors (46744970580).

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

18704791980 is a wasteful number, since it uses less digits than its factorization.

18704791980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138868 (or 138863 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 54.

The spelling of 18704791980 in words is "eighteen billion, seven hundred four million, seven hundred ninety-one thousand, nine hundred eighty".