18426220 has 48 divisors (see below), whose sum is σ = 41404608. Its totient is φ = 6871040.

The previous prime is 18426211. The next prime is 18426227. The reversal of 18426220 is 2262481.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18426227) by changing a digit.

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, 18372 + ... + 19348.

It is an arithmetic number, because the mean of its divisors is an integer number (862596).

Almost surely, 2^18426220 is an apocalyptic number.

18426220 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 18426220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20702304).

18426220 is an abundant number, since it is smaller than the sum of its proper divisors (22978388).

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

18426220 is a wasteful number, since it uses less digits than its factorization.

18426220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050 (or 1048 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 18426220 is about 4292.5773143882. The cubic root of 18426220 is about 264.1265654226.

The spelling of 18426220 in words is "eighteen million, four hundred twenty-six thousand, two hundred twenty".