20984218 has 8 divisors (see below), whose sum is σ = 31665312. Its totient is φ = 10429116.

The previous prime is 20984209. The next prime is 20984219. The reversal of 20984218 is 81248902.

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

It is not an unprimeable number, because it can be changed into a prime (20984219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31080 + ... + 31747.

It is an arithmetic number, because the mean of its divisors is an integer number (3958164).

Almost surely, 2^20984218 is an apocalyptic number.

20984218 is a deficient number, since it is larger than the sum of its proper divisors (10681094).

20984218 is a wasteful number, since it uses less digits than its factorization.

20984218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62996.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 20984218 is about 4580.8534139394. The cubic root of 20984218 is about 275.8232870772.

The spelling of 20984218 in words is "twenty million, nine hundred eighty-four thousand, two hundred eighteen".