18220061 has 4 divisors (see below), whose sum is σ = 18306624. Its totient is φ = 18133500.

The previous prime is 18220057. The next prime is 18220087. The reversal of 18220061 is 16002281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18220061 - 2² = 18220057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42965 + ... + 43386.

It is an arithmetic number, because the mean of its divisors is an integer number (4576656).

Almost surely, 2^18220061 is an apocalyptic number.

It is an amenable number.

18220061 is a deficient number, since it is larger than the sum of its proper divisors (86563).

18220061 is an equidigital number, since it uses as much as digits as its factorization.

18220061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86562.

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

The square root of 18220061 is about 4268.4963394619. The cubic root of 18220061 is about 263.1378219068.

The spelling of 18220061 in words is "eighteen million, two hundred twenty thousand, sixty-one".