18883220 has 12 divisors (see below), whose sum is σ = 39654804. Its totient is φ = 7553280.

The previous prime is 18883201. The next prime is 18883259. The reversal of 18883220 is 2238881.

It can be written as a sum of positive squares in 2 ways, for example, as 2979076 + 15904144 = 1726^2 + 3988^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 472061 + ... + 472100.

It is an arithmetic number, because the mean of its divisors is an integer number (3304567).

Almost surely, 2^18883220 is an apocalyptic number.

18883220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18883220 is an abundant number, since it is smaller than the sum of its proper divisors (20771584).

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

18883220 is a wasteful number, since it uses less digits than its factorization.

18883220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944170 (or 944168 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 18883220 is about 4345.4827119665. The cubic root of 18883220 is about 266.2923463397.

The spelling of 18883220 in words is "eighteen million, eight hundred eighty-three thousand, two hundred twenty".