20919434 has 4 divisors (see below), whose sum is σ = 31379154. Its totient is φ = 10459716.

The previous prime is 20919433. The next prime is 20919449. The reversal of 20919434 is 43491902.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10660225 + 10259209 = 3265^2 + 3203^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20919434.

It is not an unprimeable number, because it can be changed into a prime (20919433) 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 as a sum of consecutive naturals, namely, 5229857 + ... + 5229860.

Almost surely, 2^20919434 is an apocalyptic number.

20919434 is a deficient number, since it is larger than the sum of its proper divisors (10459720).

20919434 is a wasteful number, since it uses less digits than its factorization.

20919434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10459719.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 20919434 is about 4573.7767763633. The cubic root of 20919434 is about 275.5391472506.

The spelling of 20919434 in words is "twenty million, nine hundred nineteen thousand, four hundred thirty-four".