20733565 has 8 divisors (see below), whose sum is σ = 24907320. Its totient is φ = 16568832.

The previous prime is 20733563. The next prime is 20733571. The reversal of 20733565 is 56533702.

It can be written as a sum of positive squares in 4 ways, for example, as 9078169 + 11655396 = 3013^2 + 3414^2 .

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 20733565 - 2¹ = 20733563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20733563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4837 + ... + 8053.

It is an arithmetic number, because the mean of its divisors is an integer number (3113415).

Almost surely, 2^20733565 is an apocalyptic number.

It is an amenable number.

20733565 is a deficient number, since it is larger than the sum of its proper divisors (4173755).

20733565 is a wasteful number, since it uses less digits than its factorization.

20733565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511.

The product of its (nonzero) digits is 18900, while the sum is 31.

The square root of 20733565 is about 4553.4124566088. The cubic root of 20733565 is about 274.7206640141.

The spelling of 20733565 in words is "twenty million, seven hundred thirty-three thousand, five hundred sixty-five".