20730841 has 4 divisors (see below), whose sum is σ = 21291172. Its totient is φ = 20170512.

The previous prime is 20730839. The next prime is 20730869. The reversal of 20730841 is 14803702.

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 10265616 + 10465225 = 3204^2 + 3235^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730841 - 2¹ = 20730839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20733841) 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, 280110 + ... + 280183.

It is an arithmetic number, because the mean of its divisors is an integer number (5322793).

Almost surely, 2^20730841 is an apocalyptic number.

It is an amenable number.

20730841 is a deficient number, since it is larger than the sum of its proper divisors (560331).

20730841 is an equidigital number, since it uses as much as digits as its factorization.

20730841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560330.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20730841 is about 4553.1133304586. The cubic root of 20730841 is about 274.7086324466.

The spelling of 20730841 in words is "twenty million, seven hundred thirty thousand, eight hundred forty-one".