18868220 has 48 divisors (see below), whose sum is σ = 45534720. Its totient is φ = 6433344.

The previous prime is 18868207. The next prime is 18868229. The reversal of 18868220 is 2286881.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18868229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42761 + ... + 43199.

It is an arithmetic number, because the mean of its divisors is an integer number (948640).

Almost surely, 2^18868220 is an apocalyptic number.

18868220 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 18868220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22767360).

18868220 is an abundant number, since it is smaller than the sum of its proper divisors (26666500).

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

18868220 is a wasteful number, since it uses less digits than its factorization.

18868220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762 (or 760 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 18868220 is about 4343.7564388441. The cubic root of 18868220 is about 266.2218173495.

The spelling of 18868220 in words is "eighteen million, eight hundred sixty-eight thousand, two hundred twenty".