20123218 has 8 divisors (see below), whose sum is σ = 30352140. Its totient is φ = 10005840.

The previous prime is 20123179. The next prime is 20123231. The reversal of 20123218 is 81232102.

It can be written as a sum of positive squares in 2 ways, for example, as 12131289 + 7991929 = 3483^2 + 2827^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20123195 and 20123204.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 27433 + ... + 28156.

Almost surely, 2^20123218 is an apocalyptic number.

20123218 is a deficient number, since it is larger than the sum of its proper divisors (10228922).

20123218 is a wasteful number, since it uses less digits than its factorization.

20123218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55772.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 20123218 is about 4485.8909928798. The cubic root of 20123218 is about 271.9980626304.

The spelling of 20123218 in words is "twenty million, one hundred twenty-three thousand, two hundred eighteen".