18270920 has 64 divisors (see below), whose sum is σ = 44135280. Its totient is φ = 6782976.

The previous prime is 18270893. The next prime is 18270961. The reversal of 18270920 is 2907281.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 6832996 + 11437924 = 2614^2 + 3382^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65822 + ... + 66098.

Almost surely, 2^18270920 is an apocalyptic number.

18270920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18270920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22067640).

18270920 is an abundant number, since it is smaller than the sum of its proper divisors (25864360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18270920 is a wasteful number, since it uses less digits than its factorization.

18270920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18270920 is about 4274.4496721800. The cubic root of 18270920 is about 263.3824331170.

The spelling of 18270920 in words is "eighteen million, two hundred seventy thousand, nine hundred twenty".