18220311 has 12 divisors (see below), whose sum is σ = 27866592. Its totient is φ = 11432256.

The previous prime is 18220291. The next prime is 18220313. The reversal of 18220311 is 11302281.

It is not a de Polignac number, because 18220311 - 2⁶ = 18220247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59391 + ... + 59696.

It is an arithmetic number, because the mean of its divisors is an integer number (2322216).

Almost surely, 2^18220311 is an apocalyptic number.

18220311 is a deficient number, since it is larger than the sum of its proper divisors (9646281).

18220311 is a wasteful number, since it uses less digits than its factorization.

18220311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119110 (or 119107 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18220311 is about 4268.5256236785. The cubic root of 18220311 is about 263.1390254183.

Adding to 18220311 its reverse (11302281), we get a palindrome (29522592).

The spelling of 18220311 in words is "eighteen million, two hundred twenty thousand, three hundred eleven".