18940320 has 144 divisors (see below), whose sum is σ = 73906560. Its totient is φ = 4326912.

The previous prime is 18940309. The next prime is 18940333. The reversal of 18940320 is 2304981.

It is a tau number, because it is divible by the number of its divisors (144).

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, 9141 + ... + 11019.

It is an arithmetic number, because the mean of its divisors is an integer number (513240).

Almost surely, 2^18940320 is an apocalyptic number.

18940320 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 18940320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36953280).

18940320 is an abundant number, since it is smaller than the sum of its proper divisors (54966240).

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

18940320 is a wasteful number, since it uses less digits than its factorization.

18940320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907 (or 1896 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 18940320 is about 4352.0477938552. The cubic root of 18940320 is about 266.5604855042.

The spelling of 18940320 in words is "eighteen million, nine hundred forty thousand, three hundred twenty".