18884020 has 36 divisors (see below), whose sum is σ = 40495140. Its totient is φ = 7396224.

The previous prime is 18883999. The next prime is 18884029. The reversal of 18884020 is 2048881.

It can be written as a sum of positive squares in 2 ways, for example, as 5134756 + 13749264 = 2266^2 + 3708^2 .

It is a super-2 number, since 2×18884020² = 713212422720800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18884029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183289 + ... + 183391.

It is an arithmetic number, because the mean of its divisors is an integer number (1124865).

Almost surely, 2^18884020 is an apocalyptic number.

18884020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18884020 is an abundant number, since it is smaller than the sum of its proper divisors (21611120).

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

18884020 is a wasteful number, since it uses less digits than its factorization.

18884020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 18884020 is about 4345.5747606042. The cubic root of 18884020 is about 266.2961068366.

The spelling of 18884020 in words is "eighteen million, eight hundred eighty-four thousand, twenty".