20194905 has 16 divisors (see below), whose sum is σ = 32569344. Its totient is φ = 10684800.

The previous prime is 20194903. The next prime is 20194921. The reversal of 20194905 is 50949102.

It is a happy number.

It is not a de Polignac number, because 20194905 - 2¹ = 20194903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20194903) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3396 + ... + 7205.

It is an arithmetic number, because the mean of its divisors is an integer number (2035584).

Almost surely, 2^20194905 is an apocalyptic number.

It is an amenable number.

20194905 is a deficient number, since it is larger than the sum of its proper divisors (12374439).

20194905 is a wasteful number, since it uses less digits than its factorization.

20194905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10736.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 20194905 is about 4493.8741637923. The cubic root of 20194905 is about 272.3206686988.

The spelling of 20194905 in words is "twenty million, one hundred ninety-four thousand, nine hundred five".