18905340720 has 120 divisors (see below), whose sum is σ = 68175015984. Its totient is φ = 4321218048.

The previous prime is 18905340719. The next prime is 18905340733. The reversal of 18905340720 is 2704350981.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 792039 + ... + 815558.

Almost surely, 2^18905340720 is an apocalyptic number.

18905340720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18905340720 is an abundant number, since it is smaller than the sum of its proper divisors (49269675264).

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

18905340720 is a wasteful number, since it uses less digits than its factorization.

18905340720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1607627 (or 1607614 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The spelling of 18905340720 in words is "eighteen billion, nine hundred five million, three hundred forty thousand, seven hundred twenty".