18520740 has 72 divisors (see below), whose sum is σ = 64209600. Its totient is φ = 4233024.

The previous prime is 18520729. The next prime is 18520751. The reversal of 18520740 is 4702581.

It is an interprime number because it is at equal distance from previous prime (18520729) and next prime (18520751).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6090 + ... + 8609.

It is an arithmetic number, because the mean of its divisors is an integer number (891800).

Almost surely, 2^18520740 is an apocalyptic number.

18520740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18520740 is an abundant number, since it is smaller than the sum of its proper divisors (45688860).

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

18520740 is a wasteful number, since it uses less digits than its factorization.

18520740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14721 (or 14716 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 18520740 is about 4303.5729342025. The cubic root of 18520740 is about 264.5774207178.

The spelling of 18520740 in words is "eighteen million, five hundred twenty thousand, seven hundred forty".