18854220 has 216 divisors, whose sum is σ = 68774832. Its totient is φ = 3843840.

The previous prime is 18854189. The next prime is 18854233. The reversal of 18854220 is 2245881.

It is a super-2 number, since 2×18854220² = 710963223616800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 71 ways as a sum of consecutive naturals, for example, 355714 + ... + 355766.

It is an arithmetic number, because the mean of its divisors is an integer number (318402).

Almost surely, 2^18854220 is an apocalyptic number.

18854220 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 18854220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34387416).

18854220 is an abundant number, since it is smaller than the sum of its proper divisors (49920612).

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

18854220 is a wasteful number, since it uses less digits than its factorization.

18854220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 18854220 is about 4342.1446314005. The cubic root of 18854220 is about 266.1559565591.

It can be divided in two parts, 1885 and 4220, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 18854220 in words is "eighteen million, eight hundred fifty-four thousand, two hundred twenty".