20748799 has 4 divisors (see below), whose sum is σ = 20758360. Its totient is φ = 20739240.

The previous prime is 20748773. The next prime is 20748803. The reversal of 20748799 is 99784702.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 99784702 = 2 ⋅49892351.

It is a cyclic number.

It is not a de Polignac number, because 20748799 - 2¹⁹ = 20224511 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 (20748709) 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 3 ways as a sum of consecutive naturals, for example, 217 + ... + 6445.

It is an arithmetic number, because the mean of its divisors is an integer number (5189590).

Almost surely, 2^20748799 is an apocalyptic number.

20748799 is a deficient number, since it is larger than the sum of its proper divisors (9561).

20748799 is an equidigital number, since it uses as much as digits as its factorization.

20748799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9560.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 20748799 is about 4555.0849607883. The cubic root of 20748799 is about 274.7879312692.

The spelling of 20748799 in words is "twenty million, seven hundred forty-eight thousand, seven hundred ninety-nine".