20106565 has 8 divisors (see below), whose sum is σ = 24194808. Its totient is φ = 16040640.

The previous prime is 20106521. The next prime is 20106589. The reversal of 20106565 is 56560102.

It can be written as a sum of positive squares in 4 ways, for example, as 1079521 + 19027044 = 1039^2 + 4362^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20106565 - 2¹³ = 20098373 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 7 ways as a sum of consecutive naturals, for example, 3526 + ... + 7255.

It is an arithmetic number, because the mean of its divisors is an integer number (3024351).

Almost surely, 2^20106565 is an apocalyptic number.

It is an amenable number.

20106565 is a deficient number, since it is larger than the sum of its proper divisors (4088243).

20106565 is a wasteful number, since it uses less digits than its factorization.

20106565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11159.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 20106565 is about 4484.0344557106. The cubic root of 20106565 is about 271.9230111186.

Adding to 20106565 its reverse (56560102), we get a palindrome (76666667).

The spelling of 20106565 in words is "twenty million, one hundred six thousand, five hundred sixty-five".