18928220 has 12 divisors (see below), whose sum is σ = 39749304. Its totient is φ = 7571280.

The previous prime is 18928219. The next prime is 18928223. The reversal of 18928220 is 2282981.

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 not an unprimeable number, because it can be changed into a prime (18928223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 473186 + ... + 473225.

It is an arithmetic number, because the mean of its divisors is an integer number (3312442).

Almost surely, 2^18928220 is an apocalyptic number.

18928220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18928220 is an abundant number, since it is smaller than the sum of its proper divisors (20821084).

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

18928220 is a wasteful number, since it uses less digits than its factorization.

18928220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946420 (or 946418 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 18928220 is about 4350.6574215858. The cubic root of 18928220 is about 266.5037094666.

The spelling of 18928220 in words is "eighteen million, nine hundred twenty-eight thousand, two hundred twenty".