18220834 has 4 divisors (see below), whose sum is σ = 27331254. Its totient is φ = 9110416.

The previous prime is 18220823. The next prime is 18220841. The reversal of 18220834 is 43802281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43802281 = 23 ⋅1904447.

It can be written as a sum of positive squares in only one way, i.e., 9828225 + 8392609 = 3135^2 + 2897^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4555207 + ... + 4555210.

Almost surely, 2^18220834 is an apocalyptic number.

18220834 is a deficient number, since it is larger than the sum of its proper divisors (9110420).

18220834 is an equidigital number, since it uses as much as digits as its factorization.

18220834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9110419.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 18220834 is about 4268.5868856098. The cubic root of 18220834 is about 263.1415431286.

The spelling of 18220834 in words is "eighteen million, two hundred twenty thousand, eight hundred thirty-four".