18845520 has 160 divisors (see below), whose sum is σ = 64281600. Its totient is φ = 4546560.

The previous prime is 18845513. The next prime is 18845521. The reversal of 18845520 is 2554881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18845521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 126406 + ... + 126554.

It is an arithmetic number, because the mean of its divisors is an integer number (401760).

Almost surely, 2^18845520 is an apocalyptic number.

18845520 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 18845520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32140800).

18845520 is an abundant number, since it is smaller than the sum of its proper divisors (45436080).

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

18845520 is a wasteful number, since it uses less digits than its factorization.

18845520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 18845520 is about 4341.1427067075. The cubic root of 18845520 is about 266.1150123554.

The spelling of 18845520 in words is "eighteen million, eight hundred forty-five thousand, five hundred twenty".