20968775 has 6 divisors (see below), whose sum is σ = 26001312. Its totient is φ = 16775000.

The previous prime is 20968771. The next prime is 20968793. The reversal of 20968775 is 57786902.

It is not a de Polignac number, because 20968775 - 2² = 20968771 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20968771) by changing a digit.

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, 419351 + ... + 419400.

It is an arithmetic number, because the mean of its divisors is an integer number (4333552).

Almost surely, 2^20968775 is an apocalyptic number.

20968775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20968775 is a deficient number, since it is larger than the sum of its proper divisors (5032537).

20968775 is an equidigital number, since it uses as much as digits as its factorization.

20968775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838761 (or 838756 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 20968775 is about 4579.1675007582. The cubic root of 20968775 is about 275.7556078915.

The spelling of 20968775 in words is "twenty million, nine hundred sixty-eight thousand, seven hundred seventy-five".