20269565 has 8 divisors (see below), whose sum is σ = 24364248. Its totient is φ = 16188480.

The previous prime is 20269553. The next prime is 20269573. The reversal of 20269565 is 56596202.

It can be written as a sum of positive squares in 4 ways, for example, as 10067929 + 10201636 = 3173^2 + 3194^2 .

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

It is not a de Polignac number, because 20269565 - 2¹⁶ = 20204029 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, 239 + ... + 6371.

It is an arithmetic number, because the mean of its divisors is an integer number (3045531).

Almost surely, 2^20269565 is an apocalyptic number.

It is an amenable number.

20269565 is a deficient number, since it is larger than the sum of its proper divisors (4094683).

20269565 is an equidigital number, since it uses as much as digits as its factorization.

20269565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6799.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 20269565 is about 4502.1733640543. The cubic root of 20269565 is about 272.6558432971.

The spelling of 20269565 in words is "twenty million, two hundred sixty-nine thousand, five hundred sixty-five".