20104613 has 4 divisors (see below), whose sum is σ = 20251500. Its totient is φ = 19957728.

The previous prime is 20104589. The next prime is 20104619. The reversal of 20104613 is 31640102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6723649 + 13380964 = 2593^2 + 3658^2 .

It is a cyclic number.

It is not a de Polignac number, because 20104613 - 2⁶ = 20104549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20104591 and 20104600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20104619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73238 + ... + 73511.

It is an arithmetic number, because the mean of its divisors is an integer number (5062875).

Almost surely, 2^20104613 is an apocalyptic number.

It is an amenable number.

20104613 is a deficient number, since it is larger than the sum of its proper divisors (146887).

20104613 is a wasteful number, since it uses less digits than its factorization.

20104613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146886.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 20104613 is about 4483.8167892990. The cubic root of 20104613 is about 271.9142111587.

Adding to 20104613 its reverse (31640102), we get a palindrome (51744715).

The spelling of 20104613 in words is "twenty million, one hundred four thousand, six hundred thirteen".