20736765 has 24 divisors (see below), whose sum is σ = 41079168. Its totient is φ = 9479520.

The previous prime is 20736763. The next prime is 20736773. The reversal of 20736765 is 56763702.

It is a happy number.

It is not a de Polignac number, because 20736765 - 2¹ = 20736763 is a prime.

It is a super-3 number, since 3×20736765³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20736763) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32601 + ... + 33230.

It is an arithmetic number, because the mean of its divisors is an integer number (1711632).

Almost surely, 2^20736765 is an apocalyptic number.

It is an amenable number.

20736765 is a deficient number, since it is larger than the sum of its proper divisors (20342403).

20736765 is a wasteful number, since it uses less digits than its factorization.

20736765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65849 (or 65846 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 20736765 is about 4553.7638278681. The cubic root of 20736765 is about 274.7347966682.

The spelling of 20736765 in words is "twenty million, seven hundred thirty-six thousand, seven hundred sixty-five".