20561119 has 4 divisors (see below), whose sum is σ = 20581560. Its totient is φ = 20540680.

The previous prime is 20561117. The next prime is 20561147. The reversal of 20561119 is 91116502.

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 20561119 - 2¹ = 20561117 is a prime.

It is a super-2 number, since 2×20561119² = 845519229064322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20561093 and 20561102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20561111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8629 + ... + 10750.

It is an arithmetic number, because the mean of its divisors is an integer number (5145390).

Almost surely, 2^20561119 is an apocalyptic number.

20561119 is a deficient number, since it is larger than the sum of its proper divisors (20441).

20561119 is a wasteful number, since it uses less digits than its factorization.

20561119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20440.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 20561119 is about 4534.4370102583. The cubic root of 20561119 is about 273.9569035527.

The spelling of 20561119 in words is "twenty million, five hundred sixty-one thousand, one hundred nineteen".