20340743 has 4 divisors (see below), whose sum is σ = 20996928. Its totient is φ = 19684560.

The previous prime is 20340739. The next prime is 20340751. The reversal of 20340743 is 34704302.

20340743 = 542² + 543² + ... + 603².

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34704302 = 2 ⋅17352151.

It is a cyclic number.

It is not a de Polignac number, because 20340743 - 2² = 20340739 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 (20340443) 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, 328046 + ... + 328107.

It is an arithmetic number, because the mean of its divisors is an integer number (5249232).

Almost surely, 2^20340743 is an apocalyptic number.

20340743 is a deficient number, since it is larger than the sum of its proper divisors (656185).

20340743 is an equidigital number, since it uses as much as digits as its factorization.

20340743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656184.

The product of its (nonzero) digits is 2016, while the sum is 23.

The square root of 20340743 is about 4510.0712854677. The cubic root of 20340743 is about 272.9746204944.

The spelling of 20340743 in words is "twenty million, three hundred forty thousand, seven hundred forty-three".