20135765 has 8 divisors (see below), whose sum is σ = 26021688. Its totient is φ = 14869440.

The previous prime is 20135761. The next prime is 20135767. The reversal of 20135765 is 56753102.

It can be written as a sum of positive squares in 4 ways, for example, as 145924 + 19989841 = 382^2 + 4471^2 .

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

It is not a de Polignac number, because 20135765 - 2² = 20135761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20135761) 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, 154826 + ... + 154955.

It is an arithmetic number, because the mean of its divisors is an integer number (3252711).

Almost surely, 2^20135765 is an apocalyptic number.

It is an amenable number.

20135765 is a deficient number, since it is larger than the sum of its proper divisors (5885923).

20135765 is a wasteful number, since it uses less digits than its factorization.

20135765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309799.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 20135765 is about 4487.2892708182. The cubic root of 20135765 is about 272.0545819313.

Adding to 20135765 its reverse (56753102), we get a palindrome (76888867).

The spelling of 20135765 in words is "twenty million, one hundred thirty-five thousand, seven hundred sixty-five".