20775399 has 8 divisors (see below), whose sum is σ = 27738480. Its totient is φ = 13831296.

The previous prime is 20775383. The next prime is 20775413. The reversal of 20775399 is 99357702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20775399 - 2⁴ = 20775383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20775399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20775329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1954 + ... + 6735.

It is an arithmetic number, because the mean of its divisors is an integer number (3467310).

Almost surely, 2^20775399 is an apocalyptic number.

20775399 is a deficient number, since it is larger than the sum of its proper divisors (6963081).

20775399 is an equidigital number, since it uses as much as digits as its factorization.

20775399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9489.

The product of its (nonzero) digits is 119070, while the sum is 42.

The square root of 20775399 is about 4558.0038394016. The cubic root of 20775399 is about 274.9053073425.

The spelling of 20775399 in words is "twenty million, seven hundred seventy-five thousand, three hundred ninety-nine".