18985560 has 128 divisors (see below), whose sum is σ = 65491200. Its totient is φ = 4354560.

The previous prime is 18985559. The next prime is 18985567. The reversal of 18985560 is 6558981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18985567) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24702 + ... + 25458.

It is an arithmetic number, because the mean of its divisors is an integer number (511650).

Almost surely, 2^18985560 is an apocalyptic number.

18985560 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 18985560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32745600).

18985560 is an abundant number, since it is smaller than the sum of its proper divisors (46505640).

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

18985560 is a wasteful number, since it uses less digits than its factorization.

18985560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 18985560 is about 4357.2422471100. The cubic root of 18985560 is about 266.7725482313.

The spelling of 18985560 in words is "eighteen million, nine hundred eighty-five thousand, five hundred sixty".