18723680 has 24 divisors (see below), whose sum is σ = 44235072. Its totient is φ = 7489408.

The previous prime is 18723671. The next prime is 18723701. The reversal of 18723680 is 8632781.

It is a self number, because there is not a number n which added to its sum of digits gives 18723680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58352 + ... + 58671.

It is an arithmetic number, because the mean of its divisors is an integer number (1843128).

Almost surely, 2^18723680 is an apocalyptic number.

18723680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18723680 is an abundant number, since it is smaller than the sum of its proper divisors (25511392).

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

18723680 is a wasteful number, since it uses less digits than its factorization.

18723680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117038 (or 117030 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18723680 is about 4327.0867798093. The cubic root of 18723680 is about 265.5402766475.

The spelling of 18723680 in words is "eighteen million, seven hundred twenty-three thousand, six hundred eighty".