18020025 has 27 divisors (see below), whose sum is σ = 32390319. Its totient is φ = 9576720.

The previous prime is 18020011. The next prime is 18020027. The reversal of 18020025 is 52002081.

The square root of 18020025 is 4245.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6487209 + 11532816 = 2547^2 + 3396^2 .

It is not a de Polignac number, because 18020025 - 2⁵ = 18019993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18020027) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 63534 + ... + 63816.

Almost surely, 2^18020025 is an apocalyptic number.

18020025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18020025 is the 4245-th square number.

18020025 is the 2123-rd centered octagonal number.

It is an amenable number.

18020025 is a deficient number, since it is larger than the sum of its proper divisors (14370294).

18020025 is an equidigital number, since it uses as much as digits as its factorization.

18020025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 291 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The cubic root of 18020025 is about 262.1712892301.

The spelling of 18020025 in words is "eighteen million, twenty thousand, twenty-five".