20585965 has 4 divisors (see below), whose sum is σ = 24703164. Its totient is φ = 16468768.

The previous prime is 20585947. The next prime is 20585993. The reversal of 20585965 is 56958502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56958502 = 2 ⋅28479251.

It can be written as a sum of positive squares in 2 ways, for example, as 15697444 + 4888521 = 3962^2 + 2211^2 .

It is a cyclic number.

It is not a de Polignac number, because 20585965 - 2¹³ = 20577773 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 3 ways as a sum of consecutive naturals, for example, 2058592 + ... + 2058601.

It is an arithmetic number, because the mean of its divisors is an integer number (6175791).

Almost surely, 2^20585965 is an apocalyptic number.

It is an amenable number.

20585965 is a deficient number, since it is larger than the sum of its proper divisors (4117199).

20585965 is an equidigital number, since it uses as much as digits as its factorization.

20585965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117198.

The product of its (nonzero) digits is 108000, while the sum is 40.

The square root of 20585965 is about 4537.1758837409. The cubic root of 20585965 is about 274.0672087250.

The spelling of 20585965 in words is "twenty million, five hundred eighty-five thousand, nine hundred sixty-five".