20234563 has 4 divisors (see below), whose sum is σ = 21299560. Its totient is φ = 19169568.

The previous prime is 20234561. The next prime is 20234569. The reversal of 20234563 is 36543202.

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: 36543202 = 2 ⋅18271601.

It is a cyclic number.

It is not a de Polignac number, because 20234563 - 2¹ = 20234561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20234561) 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, 532470 + ... + 532507.

It is an arithmetic number, because the mean of its divisors is an integer number (5324890).

Almost surely, 2^20234563 is an apocalyptic number.

20234563 is a deficient number, since it is larger than the sum of its proper divisors (1064997).

20234563 is a wasteful number, since it uses less digits than its factorization.

20234563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064996.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 20234563 is about 4498.2844507656. The cubic root of 20234563 is about 272.4988098593.

Adding to 20234563 its reverse (36543202), we get a palindrome (56777765).

The spelling of 20234563 in words is "twenty million, two hundred thirty-four thousand, five hundred sixty-three".