18021026 has 8 divisors (see below), whose sum is σ = 27299484. Its totient is φ = 8921200.

The previous prime is 18020993. The next prime is 18021053. The reversal of 18021026 is 62012081.

It can be written as a sum of positive squares in 2 ways, for example, as 14025025 + 3996001 = 3745^2 + 1999^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 18020989 and 18021007.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44405 + ... + 44808.

Almost surely, 2^18021026 is an apocalyptic number.

18021026 is a deficient number, since it is larger than the sum of its proper divisors (9278458).

18021026 is a wasteful number, since it uses less digits than its factorization.

18021026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89316.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18021026 is about 4245.1179017785. The cubic root of 18021026 is about 262.1761436185.

Subtracting from 18021026 its sum of digits (20), we obtain a triangular number (18021006 = T₆₀₀₃).

The spelling of 18021026 in words is "eighteen million, twenty-one thousand, twenty-six".