18020203 has 2 divisors, whose sum is σ = 18020204. Its totient is φ = 18020202.

The previous prime is 18020183. The next prime is 18020231. The reversal of 18020203 is 30202081.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18020203 - 2⁹ = 18019691 is a prime.

It is a super-2 number, since 2×18020203² = 649455432322418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18020243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9010101 + 9010102.

It is an arithmetic number, because the mean of its divisors is an integer number (9010102).

Almost surely, 2^18020203 is an apocalyptic number.

18020203 is a deficient number, since it is larger than the sum of its proper divisors (1).

18020203 is an equidigital number, since it uses as much as digits as its factorization.

18020203 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 18020203 is about 4245.0209657904. The cubic root of 18020203 is about 262.1721524612.

Adding to 18020203 its reverse (30202081), we get a palindrome (48222284).

The spelling of 18020203 in words is "eighteen million, twenty thousand, two hundred three".