18720575 has 6 divisors (see below), whose sum is σ = 23213544. Its totient is φ = 14976440.

The previous prime is 18720571. The next prime is 18720577. The reversal of 18720575 is 57502781.

It is not a de Polignac number, because 18720575 - 2² = 18720571 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18720571) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 374387 + ... + 374436.

It is an arithmetic number, because the mean of its divisors is an integer number (3868924).

Almost surely, 2^18720575 is an apocalyptic number.

18720575 is a deficient number, since it is larger than the sum of its proper divisors (4492969).

18720575 is an equidigital number, since it uses as much as digits as its factorization.

18720575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748833 (or 748828 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 18720575 is about 4326.7279785075. The cubic root of 18720575 is about 265.5255974081.

The spelling of 18720575 in words is "eighteen million, seven hundred twenty thousand, five hundred seventy-five".