20730113 has 4 divisors (see below), whose sum is σ = 20835540. Its totient is φ = 20624688.

The previous prime is 20730109. The next prime is 20730119. The reversal of 20730113 is 31103702.

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 20178064 + 552049 = 4492^2 + 743^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730113 - 2² = 20730109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20730091 and 20730100.

It is not an unprimeable number, because it can be changed into a prime (20730119) 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, 52418 + ... + 52811.

It is an arithmetic number, because the mean of its divisors is an integer number (5208885).

Almost surely, 2^20730113 is an apocalyptic number.

It is an amenable number.

20730113 is a deficient number, since it is larger than the sum of its proper divisors (105427).

20730113 is a wasteful number, since it uses less digits than its factorization.

20730113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105426.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 20730113 is about 4553.0333844592. The cubic root of 20730113 is about 274.7054167831.

Adding to 20730113 its reverse (31103702), we get a palindrome (51833815).

The spelling of 20730113 in words is "twenty million, seven hundred thirty thousand, one hundred thirteen".