18721926020 has 192 divisors, whose sum is σ = 47171980800. Its totient is φ = 6109655040.

The previous prime is 18721925939. The next prime is 18721926043. The reversal of 18721926020 is 2062912781.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36781526 + ... + 36782034.

It is an arithmetic number, because the mean of its divisors is an integer number (245687400).

Almost surely, 2^18721926020 is an apocalyptic number.

18721926020 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 18721926020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23585990400).

18721926020 is an abundant number, since it is smaller than the sum of its proper divisors (28450054780).

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

18721926020 is a wasteful number, since it uses less digits than its factorization.

18721926020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 718 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 18721926020 in words is "eighteen billion, seven hundred twenty-one million, nine hundred twenty-six thousand, twenty".