20730265 has 4 divisors (see below), whose sum is σ = 24876324. Its totient is φ = 16584208.

The previous prime is 20730263. The next prime is 20730271. The reversal of 20730265 is 56203702.

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 8311689 + 12418576 = 2883^2 + 3524^2 .

It is a cyclic number.

It is not a de Polignac number, because 20730265 - 2¹ = 20730263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20730263) 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, 2073022 + ... + 2073031.

It is an arithmetic number, because the mean of its divisors is an integer number (6219081).

Almost surely, 2^20730265 is an apocalyptic number.

It is an amenable number.

20730265 is a deficient number, since it is larger than the sum of its proper divisors (4146059).

20730265 is an equidigital number, since it uses as much as digits as its factorization.

20730265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4146058.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 20730265 is about 4553.0500765970. The cubic root of 20730265 is about 274.7060881916.

Adding to 20730265 its reverse (56203702), we get a palindrome (76933967).

The spelling of 20730265 in words is "twenty million, seven hundred thirty thousand, two hundred sixty-five".