20519834 has 4 divisors (see below), whose sum is σ = 30779754. Its totient is φ = 10259916.

The previous prime is 20519831. The next prime is 20519839. The reversal of 20519834 is 43891502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43891502 = 2 ⋅21945751.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 494209 = 4475^2 + 703^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20519834.

It is not an unprimeable number, because it can be changed into a prime (20519831) 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, 5129957 + ... + 5129960.

Almost surely, 2^20519834 is an apocalyptic number.

20519834 is a deficient number, since it is larger than the sum of its proper divisors (10259920).

20519834 is a wasteful number, since it uses less digits than its factorization.

20519834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10259919.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 20519834 is about 4529.8823384278. The cubic root of 20519834 is about 273.7734198738.

The spelling of 20519834 in words is "twenty million, five hundred nineteen thousand, eight hundred thirty-four".