18020255 has 16 divisors (see below), whose sum is σ = 24979104. Its totient is φ = 12334080.

The previous prime is 18020251. The next prime is 18020263. The reversal of 18020255 is 55202081.

18020255 = 349² + 350² + ... + 458².

It is not a de Polignac number, because 18020255 - 2² = 18020251 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18020255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18020251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8702 + ... + 10571.

It is an arithmetic number, because the mean of its divisors is an integer number (1561194).

Almost surely, 2^18020255 is an apocalyptic number.

18020255 is a deficient number, since it is larger than the sum of its proper divisors (6958849).

18020255 is a wasteful number, since it uses less digits than its factorization.

18020255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19306.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 18020255 is about 4245.0270906085. The cubic root of 18020255 is about 262.1724046400.

The spelling of 18020255 in words is "eighteen million, twenty thousand, two hundred fifty-five".