18220093 has 2 divisors, whose sum is σ = 18220094. Its totient is φ = 18220092.

The previous prime is 18220087. The next prime is 18220099. The reversal of 18220093 is 39002281.

It is a balanced prime because it is at equal distance from previous prime (18220087) and next prime (18220099).

It can be written as a sum of positive squares in only one way, i.e., 17614809 + 605284 = 4197^2 + 778^2 .

It is a cyclic number.

It is not a de Polignac number, because 18220093 - 2¹³ = 18211901 is a prime.

It is the 4269-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18220099) by changing a digit.

It is a nontrivial repunit in base 4268.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9110046 + 9110047.

It is an arithmetic number, because the mean of its divisors is an integer number (9110047).

Almost surely, 2^18220093 is an apocalyptic number.

It is an amenable number.

18220093 is a deficient number, since it is larger than the sum of its proper divisors (1).

18220093 is an equidigital number, since it uses as much as digits as its factorization.

18220093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 18220093 is about 4268.5000878529. The cubic root of 18220093 is about 263.1379759569.

The spelling of 18220093 in words is "eighteen million, two hundred twenty thousand, ninety-three".