20519081 has 4 divisors (see below), whose sum is σ = 22384464. Its totient is φ = 18653700.

The previous prime is 20519077. The next prime is 20519099. The reversal of 20519081 is 18091502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20519081 - 2² = 20519077 is a prime.

It is a super-2 number, since 2×20519081² = 842065370169122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20519081.

It is not an unprimeable number, because it can be changed into a prime (20519281) 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 3 ways as a sum of consecutive naturals, for example, 932675 + ... + 932696.

It is an arithmetic number, because the mean of its divisors is an integer number (5596116).

Almost surely, 2^20519081 is an apocalyptic number.

It is an amenable number.

20519081 is a deficient number, since it is larger than the sum of its proper divisors (1865383).

20519081 is a wasteful number, since it uses less digits than its factorization.

20519081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1865382.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 20519081 is about 4529.7992229237. The cubic root of 20519081 is about 273.7700710178.

The spelling of 20519081 in words is "twenty million, five hundred nineteen thousand, eighty-one".