20963765 has 4 divisors (see below), whose sum is σ = 25156524. Its totient is φ = 16771008.

The previous prime is 20963753. The next prime is 20963773. The reversal of 20963765 is 56736902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9006001 + 11957764 = 3001^2 + 3458^2 .

It is a cyclic number.

It is not a de Polignac number, because 20963765 - 2¹⁰ = 20962741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2096372 + ... + 2096381.

It is an arithmetic number, because the mean of its divisors is an integer number (6289131).

Almost surely, 2^20963765 is an apocalyptic number.

It is an amenable number.

20963765 is a deficient number, since it is larger than the sum of its proper divisors (4192759).

20963765 is an equidigital number, since it uses as much as digits as its factorization.

20963765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4192758.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 20963765 is about 4578.6204254120. The cubic root of 20963765 is about 275.7336443506.

The spelling of 20963765 in words is "twenty million, nine hundred sixty-three thousand, seven hundred sixty-five".