20606565 has 32 divisors (see below), whose sum is σ = 37889280. Its totient is φ = 9368064.

The previous prime is 20606563. The next prime is 20606627. The reversal of 20606565 is 56560602.

It is not a de Polignac number, because 20606565 - 2¹ = 20606563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20606563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23617 + ... + 24473.

It is an arithmetic number, because the mean of its divisors is an integer number (1184040).

Almost surely, 2^20606565 is an apocalyptic number.

It is an amenable number.

20606565 is a deficient number, since it is larger than the sum of its proper divisors (17282715).

20606565 is a wasteful number, since it uses less digits than its factorization.

20606565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 20606565 is about 4539.4454507131. The cubic root of 20606565 is about 274.1585962688.

The spelling of 20606565 in words is "twenty million, six hundred six thousand, five hundred sixty-five".