18698220 has 72 divisors (see below), whose sum is σ = 57535296. Its totient is φ = 4914432.

The previous prime is 18698203. The next prime is 18698227. The reversal of 18698220 is 2289681.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18698227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12429 + ... + 13851.

Almost surely, 2^18698220 is an apocalyptic number.

18698220 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 18698220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28767648).

18698220 is an abundant number, since it is smaller than the sum of its proper divisors (38837076).

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

18698220 is a wasteful number, since it uses less digits than its factorization.

18698220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511 (or 1506 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18698220 is about 4324.1438458960. The cubic root of 18698220 is about 265.4198636716.

The spelling of 18698220 in words is "eighteen million, six hundred ninety-eight thousand, two hundred twenty".