20218345 has 8 divisors (see below), whose sum is σ = 27728064. Its totient is φ = 13863984.

The previous prime is 20218343. The next prime is 20218349. The reversal of 20218345 is 54381202.

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 20218345 - 2¹ = 20218343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20218343) 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, 288799 + ... + 288868.

It is an arithmetic number, because the mean of its divisors is an integer number (3466008).

Almost surely, 2^20218345 is an apocalyptic number.

It is an amenable number.

20218345 is a deficient number, since it is larger than the sum of its proper divisors (7509719).

20218345 is an equidigital number, since it uses as much as digits as its factorization.

20218345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577679.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 20218345 is about 4496.4814021633. The cubic root of 20218345 is about 272.4259878116.

Adding to 20218345 its reverse (54381202), we get a palindrome (74599547).

The spelling of 20218345 in words is "twenty million, two hundred eighteen thousand, three hundred forty-five".