18484820 has 12 divisors (see below), whose sum is σ = 38818164. Its totient is φ = 7393920.

The previous prime is 18484819. The next prime is 18484859. The reversal of 18484820 is 2848481.

It can be written as a sum of positive squares in 2 ways, for example, as 9746884 + 8737936 = 3122^2 + 2956^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462101 + ... + 462140.

It is an arithmetic number, because the mean of its divisors is an integer number (3234847).

Almost surely, 2^18484820 is an apocalyptic number.

18484820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18484820 is an abundant number, since it is smaller than the sum of its proper divisors (20333344).

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

18484820 is a wasteful number, since it uses less digits than its factorization.

18484820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924250 (or 924248 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 18484820 is about 4299.3976322271. The cubic root of 18484820 is about 264.4062653625.

The spelling of 18484820 in words is "eighteen million, four hundred eighty-four thousand, eight hundred twenty".