20775385 has 4 divisors (see below), whose sum is σ = 24930468. Its totient is φ = 16620304.

The previous prime is 20775383. The next prime is 20775413. The reversal of 20775385 is 58357702.

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 9072144 + 11703241 = 3012^2 + 3421^2 .

It is a cyclic number.

It is not a de Polignac number, because 20775385 - 2¹ = 20775383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20775383) 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, 2077534 + ... + 2077543.

It is an arithmetic number, because the mean of its divisors is an integer number (6232617).

Almost surely, 2^20775385 is an apocalyptic number.

It is an amenable number.

20775385 is a deficient number, since it is larger than the sum of its proper divisors (4155083).

20775385 is an equidigital number, since it uses as much as digits as its factorization.

20775385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4155082.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 20775385 is about 4558.0023036414. The cubic root of 20775385 is about 274.9052455919.

The spelling of 20775385 in words is "twenty million, seven hundred seventy-five thousand, three hundred eighty-five".