18020487 has 8 divisors (see below), whose sum is σ = 24047104. Its totient is φ = 12003768.

The previous prime is 18020479. The next prime is 18020489. The reversal of 18020487 is 78402081.

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

It is not a de Polignac number, because 18020487 - 2³ = 18020479 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 (18020489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5028 + ... + 7830.

It is an arithmetic number, because the mean of its divisors is an integer number (3005888).

Almost surely, 2^18020487 is an apocalyptic number.

18020487 is a deficient number, since it is larger than the sum of its proper divisors (6026617).

18020487 is a wasteful number, since it uses less digits than its factorization.

18020487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4949.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 18020487 is about 4245.0544166123. The cubic root of 18020487 is about 262.1735297394.

The spelling of 18020487 in words is "eighteen million, twenty thousand, four hundred eighty-seven".