20965775 has 6 divisors (see below), whose sum is σ = 25997592. Its totient is φ = 16772600.

The previous prime is 20965757. The next prime is 20965817. The reversal of 20965775 is 57756902.

It is not a de Polignac number, because 20965775 - 2¹⁶ = 20900239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 419291 + ... + 419340.

It is an arithmetic number, because the mean of its divisors is an integer number (4332932).

Almost surely, 2^20965775 is an apocalyptic number.

20965775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20965775 is a deficient number, since it is larger than the sum of its proper divisors (5031817).

20965775 is an equidigital number, since it uses as much as digits as its factorization.

20965775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838641 (or 838636 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 41.

The square root of 20965775 is about 4578.8399185820. The cubic root of 20965775 is about 275.7424564909.

The spelling of 20965775 in words is "twenty million, nine hundred sixty-five thousand, seven hundred seventy-five".