20196565 has 8 divisors (see below), whose sum is σ = 24285528. Its totient is φ = 16124160.

The previous prime is 20196529. The next prime is 20196577. The reversal of 20196565 is 56569102.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5885476 + 14311089 = 2426^2 + 3783^2 .

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

It is not a de Polignac number, because 20196565 - 2⁷ = 20196437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20196565.

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, 1272 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (3035691).

Almost surely, 2^20196565 is an apocalyptic number.

It is an amenable number.

20196565 is a deficient number, since it is larger than the sum of its proper divisors (4088963).

20196565 is an equidigital number, since it uses as much as digits as its factorization.

20196565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8279.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 20196565 is about 4494.0588558674. The cubic root of 20196565 is about 272.3281299855.

It can be divided in two parts, 201 and 96565, that multiplied together give a triangular number (19409565 = T₆₂₃₀).

The spelling of 20196565 in words is "twenty million, one hundred ninety-six thousand, five hundred sixty-five".