20820218 has 8 divisors (see below), whose sum is σ = 31606848. Its totient is φ = 10284604.

The previous prime is 20820211. The next prime is 20820227. The reversal of 20820218 is 81202802.

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20820193 and 20820202.

It is not an unprimeable number, because it can be changed into a prime (20820211) 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, 62546 + ... + 62877.

It is an arithmetic number, because the mean of its divisors is an integer number (3950856).

Almost surely, 2^20820218 is an apocalyptic number.

20820218 is a deficient number, since it is larger than the sum of its proper divisors (10786630).

20820218 is a wasteful number, since it uses less digits than its factorization.

20820218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125508.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 20820218 is about 4562.9177069064. The cubic root of 20820218 is about 275.1028507849.

The spelling of 20820218 in words is "twenty million, eight hundred twenty thousand, two hundred eighteen".