20788743 has 4 divisors (see below), whose sum is σ = 27718328. Its totient is φ = 13859160.

The previous prime is 20788741. The next prime is 20788751. The reversal of 20788743 is 34788702.

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

It is not a de Polignac number, because 20788743 - 2¹ = 20788741 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 (20788741) 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 3 ways as a sum of consecutive naturals, for example, 3464788 + ... + 3464793.

It is an arithmetic number, because the mean of its divisors is an integer number (6929582).

Almost surely, 2^20788743 is an apocalyptic number.

20788743 is a deficient number, since it is larger than the sum of its proper divisors (6929585).

20788743 is an equidigital number, since it uses as much as digits as its factorization.

20788743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6929584.

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 20788743 is about 4559.4674031075. The cubic root of 20788743 is about 274.9641518010.

The spelling of 20788743 in words is "twenty million, seven hundred eighty-eight thousand, seven hundred forty-three".