20744455 has 4 divisors (see below), whose sum is σ = 24893352. Its totient is φ = 16595560.

The previous prime is 20744443. The next prime is 20744467. The reversal of 20744455 is 55444702.

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

It is an interprime number because it is at equal distance from previous prime (20744443) and next prime (20744467).

It is not a de Polignac number, because 20744455 - 2⁷ = 20744327 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2074441 + ... + 2074450.

It is an arithmetic number, because the mean of its divisors is an integer number (6223338).

Almost surely, 2^20744455 is an apocalyptic number.

20744455 is a deficient number, since it is larger than the sum of its proper divisors (4148897).

20744455 is an equidigital number, since it uses as much as digits as its factorization.

20744455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4148896.

The product of its (nonzero) digits is 22400, while the sum is 31.

The square root of 20744455 is about 4554.6081060833. The cubic root of 20744455 is about 274.7687532582.

The spelling of 20744455 in words is "twenty million, seven hundred forty-four thousand, four hundred fifty-five".