18063720 has 48 divisors (see below), whose sum is σ = 58708260. Its totient is φ = 4816896.

The previous prime is 18063709. The next prime is 18063761. The reversal of 18063720 is 2736081.

18063720 is a `hidden beast` number, since 1 + 8 + 0 + 637 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16305444 + 1758276 = 4038^2 + 1326^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24729 + ... + 25448.

Almost surely, 2^18063720 is an apocalyptic number.

18063720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18063720 is an abundant number, since it is smaller than the sum of its proper divisors (40644540).

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

18063720 is a wasteful number, since it uses less digits than its factorization.

18063720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50194 (or 50187 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 18063720 is about 4250.1435269882. The cubic root of 18063720 is about 262.3830227093.

The spelling of 18063720 in words is "eighteen million, sixty-three thousand, seven hundred twenty".