20245243 has 4 divisors (see below), whose sum is σ = 20366640. Its totient is φ = 20123848.

The previous prime is 20245237. The next prime is 20245259. The reversal of 20245243 is 34254202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34254202 = 2 ⋅17127101.

It is a cyclic number.

It is not a de Polignac number, because 20245243 - 2¹³ = 20237051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20245213) 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, 60448 + ... + 60781.

It is an arithmetic number, because the mean of its divisors is an integer number (5091660).

Almost surely, 2^20245243 is an apocalyptic number.

20245243 is a deficient number, since it is larger than the sum of its proper divisors (121397).

20245243 is a wasteful number, since it uses less digits than its factorization.

20245243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121396.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20245243 is about 4499.4714133996. The cubic root of 20245243 is about 272.5467439381.

Adding to 20245243 its reverse (34254202), we get a palindrome (54499445).

The spelling of 20245243 in words is "twenty million, two hundred forty-five thousand, two hundred forty-three".