19952218 has 16 divisors (see below), whose sum is σ = 35161056. Its totient is φ = 8371440.

The previous prime is 19952209. The next prime is 19952267. The reversal of 19952218 is 81225991.

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 7 ways as a sum of consecutive naturals, for example, 34596 + ... + 35167.

It is an arithmetic number, because the mean of its divisors is an integer number (2197566).

Almost surely, 2^19952218 is an apocalyptic number.

19952218 is a deficient number, since it is larger than the sum of its proper divisors (15208838).

19952218 is a wasteful number, since it uses less digits than its factorization.

19952218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69789.

The product of its digits is 12960, while the sum is 37.

The square root of 19952218 is about 4466.7905704208. The cubic root of 19952218 is about 271.2254221114.

The spelling of 19952218 in words is "nineteen million, nine hundred fifty-two thousand, two hundred eighteen".