18520718 has 8 divisors (see below), whose sum is σ = 29415312. Its totient is φ = 8715616.

The previous prime is 18520717. The next prime is 18520729. The reversal of 18520718 is 81702581.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 272330 + ... + 272397.

It is an arithmetic number, because the mean of its divisors is an integer number (3676914).

Almost surely, 2^18520718 is an apocalyptic number.

18520718 is a deficient number, since it is larger than the sum of its proper divisors (10894594).

18520718 is a wasteful number, since it uses less digits than its factorization.

18520718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544746.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 18520718 is about 4303.5703781860. The cubic root of 18520718 is about 264.5773159577.

The spelling of 18520718 in words is "eighteen million, five hundred twenty thousand, seven hundred eighteen".