18041520 has 80 divisors (see below), whose sum is σ = 63924480. Its totient is φ = 4123392.

The previous prime is 18041519. The next prime is 18041531. The reversal of 18041520 is 2514081.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3690 + ... + 7049.

It is an arithmetic number, because the mean of its divisors is an integer number (799056).

Almost surely, 2^18041520 is an apocalyptic number.

18041520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18041520 is an abundant number, since it is smaller than the sum of its proper divisors (45882960).

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

18041520 is a wasteful number, since it uses less digits than its factorization.

18041520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10762 (or 10756 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 18041520 is about 4247.5310475616. The cubic root of 18041520 is about 262.2754905774.

The spelling of 18041520 in words is "eighteen million, forty-one thousand, five hundred twenty".