18020232 has 40 divisors (see below), whose sum is σ = 50475150. Its totient is φ = 6006528.

The previous prime is 18020231. The next prime is 18020243. The reversal of 18020232 is 23202081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13883076 + 4137156 = 3726^2 + 2034^2 .

It is a super-2 number, since 2×18020232² = 649457522667648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18020231) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 13257 + ... + 14552.

Almost surely, 2^18020232 is an apocalyptic number.

18020232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18020232 is an abundant number, since it is smaller than the sum of its proper divisors (32454918).

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

18020232 is a wasteful number, since it uses less digits than its factorization.

18020232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27827 (or 27814 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 18020232 is about 4245.0243815554. The cubic root of 18020232 is about 262.1722930994.

The spelling of 18020232 in words is "eighteen million, twenty thousand, two hundred thirty-two".