18031700 has 18 divisors (see below), whose sum is σ = 39129006. Its totient is φ = 7212640.

The previous prime is 18031693. The next prime is 18031721. The reversal of 18031700 is 713081.

It can be written as a sum of positive squares in 3 ways, for example, as 20164 + 18011536 = 142^2 + 4244^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 90059 + ... + 90258.

Almost surely, 2^18031700 is an apocalyptic number.

18031700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18031700 is an abundant number, since it is smaller than the sum of its proper divisors (21097306).

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

18031700 is a wasteful number, since it uses less digits than its factorization.

18031700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180331 (or 180324 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 18031700 is about 4246.3749245680. The cubic root of 18031700 is about 262.2278964214.

Adding to 18031700 its reverse (713081), we get a palindrome (18744781).

The spelling of 18031700 in words is "eighteen million, thirty-one thousand, seven hundred".