20618318 has 12 divisors (see below), whose sum is σ = 35977032. Its totient is φ = 8836380.

The previous prime is 20618309. The next prime is 20618347. The reversal of 20618318 is 81381602.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105098 + ... + 105293.

It is an arithmetic number, because the mean of its divisors is an integer number (2998086).

Almost surely, 2^20618318 is an apocalyptic number.

20618318 is a deficient number, since it is larger than the sum of its proper divisors (15358714).

20618318 is a wasteful number, since it uses less digits than its factorization.

20618318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210407 (or 210400 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 20618318 is about 4540.7398075644. The cubic root of 20618318 is about 274.2107086835.

The spelling of 20618318 in words is "twenty million, six hundred eighteen thousand, three hundred eighteen".