18157320 has 96 divisors (see below), whose sum is σ = 60952320. Its totient is φ = 4682880.

The previous prime is 18157303. The next prime is 18157339. The reversal of 18157320 is 2375181.

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, 10347 + ... + 11973.

It is an arithmetic number, because the mean of its divisors is an integer number (634920).

Almost surely, 2^18157320 is an apocalyptic number.

18157320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18157320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30476160).

18157320 is an abundant number, since it is smaller than the sum of its proper divisors (42795000).

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

18157320 is a wasteful number, since it uses less digits than its factorization.

18157320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675 (or 1668 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 18157320 is about 4261.1406923499. The cubic root of 18157320 is about 262.8354351279.

The spelling of 18157320 in words is "eighteen million, one hundred fifty-seven thousand, three hundred twenty".