20408194 has 8 divisors (see below), whose sum is σ = 32413068. Its totient is φ = 9603840.

The previous prime is 20408191. The next prime is 20408231. The reversal of 20408194 is 49180402.

It can be written as a sum of positive squares in 2 ways, for example, as 19936225 + 471969 = 4465^2 + 687^2 .

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 (20408191) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 300087 + ... + 300154.

Almost surely, 2^20408194 is an apocalyptic number.

20408194 is a deficient number, since it is larger than the sum of its proper divisors (12004874).

20408194 is a wasteful number, since it uses less digits than its factorization.

20408194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600260.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20408194 is about 4517.5429162322. The cubic root of 20408194 is about 273.2760204376.

Adding to 20408194 its reverse (49180402), we get a palindrome (69588596).

It can be divided in two parts, 20408 and 194, that added together give a palindrome (20602).

The spelling of 20408194 in words is "twenty million, four hundred eight thousand, one hundred ninety-four".