20203943 has 4 divisors (see below), whose sum is σ = 20447448. Its totient is φ = 19960440.

The previous prime is 20203933. The next prime is 20203949. The reversal of 20203943 is 34930202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34930202 = 2 ⋅17465101.

It is a cyclic number.

It is not a de Polignac number, because 20203943 - 2⁶ = 20203879 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 (20203949) 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, 121628 + ... + 121793.

It is an arithmetic number, because the mean of its divisors is an integer number (5111862).

Almost surely, 2^20203943 is an apocalyptic number.

20203943 is a deficient number, since it is larger than the sum of its proper divisors (243505).

20203943 is an equidigital number, since it uses as much as digits as its factorization.

20203943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243504.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 20203943 is about 4494.8796424376. The cubic root of 20203943 is about 272.3612873124.

The spelling of 20203943 in words is "twenty million, two hundred three thousand, nine hundred forty-three".