18020259840 has 192 divisors, whose sum is σ = 62892910080. Its totient is φ = 4368465920.

The previous prime is 18020259799. The next prime is 18020259863. The reversal of 18020259840 is 4895202081.

It is a tau number, because it is divible by the number of its divisors (192).

It is a super-2 number, since 2×18020259840² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311257 + ... + 364583.

It is an arithmetic number, because the mean of its divisors is an integer number (327567240).

Almost surely, 2^18020259840 is an apocalyptic number.

18020259840 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 18020259840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31446455040).

18020259840 is an abundant number, since it is smaller than the sum of its proper divisors (44872650240).

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

18020259840 is a wasteful number, since it uses less digits than its factorization.

18020259840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53368 (or 53348 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

It can be divided in two parts, 180202 and 59840, that added together give a palindrome (240042).

The spelling of 18020259840 in words is "eighteen billion, twenty million, two hundred fifty-nine thousand, eight hundred forty".