18948220 has 12 divisors (see below), whose sum is σ = 39791304. Its totient is φ = 7579280.

The previous prime is 18948211. The next prime is 18948221. The reversal of 18948220 is 2284981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18948221) 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, 473686 + ... + 473725.

It is an arithmetic number, because the mean of its divisors is an integer number (3315942).

Almost surely, 2^18948220 is an apocalyptic number.

18948220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18948220 is an abundant number, since it is smaller than the sum of its proper divisors (20843084).

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

18948220 is a wasteful number, since it uses less digits than its factorization.

18948220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947420 (or 947418 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 18948220 is about 4352.9553179421. The cubic root of 18948220 is about 266.5975411105.

The spelling of 18948220 in words is "eighteen million, nine hundred forty-eight thousand, two hundred twenty".