18410220 has 96 divisors (see below), whose sum is σ = 58007040. Its totient is φ = 4847040.

The previous prime is 18410219. The next prime is 18410233. The reversal of 18410220 is 2201481.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 18410193 and 18410202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55455 + ... + 55785.

It is an arithmetic number, because the mean of its divisors is an integer number (604240).

Almost surely, 2^18410220 is an apocalyptic number.

18410220 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 18410220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29003520).

18410220 is an abundant number, since it is smaller than the sum of its proper divisors (39596820).

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

18410220 is a wasteful number, since it uses less digits than its factorization.

18410220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452 (or 444 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 18410220 is about 4290.7132274250. The cubic root of 18410220 is about 264.0500937999.

It can be divided in two parts, 184 and 10220, that added together give a square (10404 = 102²).

The spelling of 18410220 in words is "eighteen million, four hundred ten thousand, two hundred twenty".