20743313 has 4 divisors (see below), whose sum is σ = 20803440. Its totient is φ = 20683188.

The previous prime is 20743271. The next prime is 20743337. The reversal of 20743313 is 31334702.

It is a happy number.

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 cyclic number.

It is not a de Polignac number, because 20743313 - 2¹⁶ = 20677777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20743363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29543 + ... + 30236.

It is an arithmetic number, because the mean of its divisors is an integer number (5200860).

Almost surely, 2^20743313 is an apocalyptic number.

It is an amenable number.

20743313 is a deficient number, since it is larger than the sum of its proper divisors (60127).

20743313 is an equidigital number, since it uses as much as digits as its factorization.

20743313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60126.

The product of its (nonzero) digits is 1512, while the sum is 23.

The square root of 20743313 is about 4554.4827368209. The cubic root of 20743313 is about 274.7637110806.

The spelling of 20743313 in words is "twenty million, seven hundred forty-three thousand, three hundred thirteen".