20765633 has 4 divisors (see below), whose sum is σ = 23732160. Its totient is φ = 17799108.

The previous prime is 20765617. The next prime is 20765669. The reversal of 20765633 is 33656702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20765633 - 2⁴ = 20765617 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 20765633.

It is not an unprimeable number, because it can be changed into a prime (20765333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1483253 + ... + 1483266.

It is an arithmetic number, because the mean of its divisors is an integer number (5933040).

Almost surely, 2^20765633 is an apocalyptic number.

It is an amenable number.

20765633 is a deficient number, since it is larger than the sum of its proper divisors (2966527).

20765633 is an equidigital number, since it uses as much as digits as its factorization.

20765633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2966526.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 20765633 is about 4556.9324111731. The cubic root of 20765633 is about 274.8622252013.

The spelling of 20765633 in words is "twenty million, seven hundred sixty-five thousand, six hundred thirty-three".