18027720 has 48 divisors (see below), whose sum is σ = 58591260. Its totient is φ = 4807296.

The previous prime is 18027697. The next prime is 18027727. The reversal of 18027720 is 2772081.

It can be written as a sum of positive squares in 2 ways, for example, as 17791524 + 236196 = 4218^2 + 486^2 .

It is not an unprimeable number, because it can be changed into a prime (18027727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24679 + ... + 25398.

Almost surely, 2^18027720 is an apocalyptic number.

18027720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18027720 is an abundant number, since it is smaller than the sum of its proper divisors (40563540).

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

18027720 is a wasteful number, since it uses less digits than its factorization.

18027720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50094 (or 50087 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 18027720 is about 4245.9062636851. The cubic root of 18027720 is about 262.2086018120.

The spelling of 18027720 in words is "eighteen million, twenty-seven thousand, seven hundred twenty".