20769565 has 8 divisors (see below), whose sum is σ = 26235360. Its totient is φ = 15741072.

The previous prime is 20769547. The next prime is 20769571. The reversal of 20769565 is 56596702.

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

It is a cyclic number.

It is not a de Polignac number, because 20769565 - 2⁵ = 20769533 is a prime.

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, 109219 + ... + 109408.

It is an arithmetic number, because the mean of its divisors is an integer number (3279420).

Almost surely, 2^20769565 is an apocalyptic number.

It is an amenable number.

20769565 is a deficient number, since it is larger than the sum of its proper divisors (5465795).

20769565 is a wasteful number, since it uses less digits than its factorization.

20769565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218651.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 20769565 is about 4557.3638213336. The cubic root of 20769565 is about 274.8795726148.

The spelling of 20769565 in words is "twenty million, seven hundred sixty-nine thousand, five hundred sixty-five".