20344013 has 4 divisors (see below), whose sum is σ = 20480700. Its totient is φ = 20207328.

The previous prime is 20344007. The next prime is 20344033. The reversal of 20344013 is 31044302.

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 8219689 + 12124324 = 2867^2 + 3482^2 .

It is a cyclic number.

It is not a de Polignac number, because 20344013 - 2⁶ = 20343949 is a prime.

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 = 20343982 and 20344000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344033) 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, 68120 + ... + 68417.

It is an arithmetic number, because the mean of its divisors is an integer number (5120175).

Almost surely, 2^20344013 is an apocalyptic number.

It is an amenable number.

20344013 is a deficient number, since it is larger than the sum of its proper divisors (136687).

20344013 is a wasteful number, since it uses less digits than its factorization.

20344013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136686.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20344013 is about 4510.4337928851. The cubic root of 20344013 is about 272.9892476097.

Adding to 20344013 its reverse (31044302), we get a palindrome (51388315).

The spelling of 20344013 in words is "twenty million, three hundred forty-four thousand, thirteen".