20359243 has 4 divisors (see below), whose sum is σ = 20519680. Its totient is φ = 20198808.

The previous prime is 20359237. The next prime is 20359267. The reversal of 20359243 is 34295302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34295302 = 2 ⋅17147651.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20359243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20350243) 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, 80028 + ... + 80281.

It is an arithmetic number, because the mean of its divisors is an integer number (5129920).

Almost surely, 2^20359243 is an apocalyptic number.

20359243 is a deficient number, since it is larger than the sum of its proper divisors (160437).

20359243 is a wasteful number, since it uses less digits than its factorization.

20359243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160436.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 20359243 is about 4512.1217847040. The cubic root of 20359243 is about 273.0573526451.

It can be divided in two parts, 20359 and 243, that added together give a palindrome (20602).

The spelling of 20359243 in words is "twenty million, three hundred fifty-nine thousand, two hundred forty-three".