18220853 has 8 divisors (see below), whose sum is σ = 21729408. Its totient is φ = 14938704.

The previous prime is 18220849. The next prime is 18220861. The reversal of 18220853 is 35802281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18220853 - 2² = 18220849 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56426 + ... + 56747.

It is an arithmetic number, because the mean of its divisors is an integer number (2716176).

Almost surely, 2^18220853 is an apocalyptic number.

It is an amenable number.

18220853 is a deficient number, since it is larger than the sum of its proper divisors (3508555).

18220853 is a wasteful number, since it uses less digits than its factorization.

18220853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113203.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 18220853 is about 4268.5891111701. The cubic root of 18220853 is about 263.1416345932.

The spelling of 18220853 in words is "eighteen million, two hundred twenty thousand, eight hundred fifty-three".