20519071 has 4 divisors (see below), whose sum is σ = 20808144. Its totient is φ = 20230000.

The previous prime is 20519063. The next prime is 20519077. The reversal of 20519071 is 17091502.

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

It is a cyclic number.

It is not a de Polignac number, because 20519071 - 2³ = 20519063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20519077) 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, 144430 + ... + 144571.

It is an arithmetic number, because the mean of its divisors is an integer number (5202036).

Almost surely, 2^20519071 is an apocalyptic number.

20519071 is a deficient number, since it is larger than the sum of its proper divisors (289073).

20519071 is an equidigital number, since it uses as much as digits as its factorization.

20519071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289072.

The product of its (nonzero) digits is 630, while the sum is 25.

The square root of 20519071 is about 4529.7981191219. The cubic root of 20519071 is about 273.7700265438.

The spelling of 20519071 in words is "twenty million, five hundred nineteen thousand, seventy-one".