18820255 has 8 divisors (see below), whose sum is σ = 23313024. Its totient is φ = 14570400.

The previous prime is 18820253. The next prime is 18820259. The reversal of 18820255 is 55202881.

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

It is not a de Polignac number, because 18820255 - 2¹ = 18820253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18820253) 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, 60556 + ... + 60865.

It is an arithmetic number, because the mean of its divisors is an integer number (2914128).

Almost surely, 2^18820255 is an apocalyptic number.

18820255 is a deficient number, since it is larger than the sum of its proper divisors (4492769).

18820255 is a wasteful number, since it uses less digits than its factorization.

18820255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121457.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 18820255 is about 4338.2317826506. The cubic root of 18820255 is about 265.9960379684.

The spelling of 18820255 in words is "eighteen million, eight hundred twenty thousand, two hundred fifty-five".