18720255730 has 64 divisors (see below), whose sum is σ = 37469900160. Its totient is φ = 6676403200.

The previous prime is 18720255713. The next prime is 18720255731. The reversal of 18720255730 is 3755202781.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18720255731) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2988762 + ... + 2995018.

It is an arithmetic number, because the mean of its divisors is an integer number (585467190).

Almost surely, 2^18720255730 is an apocalyptic number.

18720255730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18720255730 is an abundant number, since it is smaller than the sum of its proper divisors (18749644430).

18720255730 is a wasteful number, since it uses less digits than its factorization.

18720255730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6795.

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 18720255730 in words is "eighteen billion, seven hundred twenty million, two hundred fifty-five thousand, seven hundred thirty".