18020672 has 42 divisors (see below), whose sum is σ = 37076634. Its totient is φ = 8689920.

The previous prime is 18020647. The next prime is 18020699. The reversal of 18020672 is 27602081.

It can be written as a sum of positive squares in only one way, i.e., 17774656 + 246016 = 4216^2 + 496^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 61358 + ... + 61650.

It is an arithmetic number, because the mean of its divisors is an integer number (882777).

Almost surely, 2^18020672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18020672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18538317).

18020672 is an abundant number, since it is smaller than the sum of its proper divisors (19055962).

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

18020672 is an equidigital number, since it uses as much as digits as its factorization.

18020672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 18020672 is about 4245.0762066187. The cubic root of 18020672 is about 262.1744269023.

The spelling of 18020672 in words is "eighteen million, twenty thousand, six hundred seventy-two".