20760565 has 12 divisors (see below), whose sum is σ = 28980396. Its totient is φ = 14235648.

The previous prime is 20760547. The next prime is 20760601. The reversal of 20760565 is 56506702.

It can be written as a sum of positive squares in 2 ways, for example, as 11573604 + 9186961 = 3402^2 + 3031^2 .

It is not a de Polignac number, because 20760565 - 2¹⁹ = 20236277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42124 + ... + 42613.

It is an arithmetic number, because the mean of its divisors is an integer number (2415033).

Almost surely, 2^20760565 is an apocalyptic number.

It is an amenable number.

20760565 is a deficient number, since it is larger than the sum of its proper divisors (8219831).

20760565 is an equidigital number, since it uses as much as digits as its factorization.

20760565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84756 (or 84749 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 20760565 is about 4556.3763014044. The cubic root of 20760565 is about 274.8398626902.

The spelling of 20760565 in words is "twenty million, seven hundred sixty thousand, five hundred sixty-five".