20743293 has 4 divisors (see below), whose sum is σ = 27657728. Its totient is φ = 13828860.

The previous prime is 20743271. The next prime is 20743337. The reversal of 20743293 is 39234702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-20743293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20743293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20743693) 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, 3457213 + ... + 3457218.

It is an arithmetic number, because the mean of its divisors is an integer number (6914432).

Almost surely, 2^20743293 is an apocalyptic number.

It is an amenable number.

20743293 is a deficient number, since it is larger than the sum of its proper divisors (6914435).

20743293 is an equidigital number, since it uses as much as digits as its factorization.

20743293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6914434.

The product of its (nonzero) digits is 9072, while the sum is 30.

The square root of 20743293 is about 4554.4805411814. The cubic root of 20743293 is about 274.7636227746.

Adding to 20743293 its reverse (39234702), we get a palindrome (59977995).

The spelling of 20743293 in words is "twenty million, seven hundred forty-three thousand, two hundred ninety-three".