20243505 has 16 divisors (see below), whose sum is σ = 32445504. Its totient is φ = 10777920.

The previous prime is 20243501. The next prime is 20243507. The reversal of 20243505 is 50534202.

20243505 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 20243505 - 2² = 20243501 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20243501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15747 + ... + 16983.

It is an arithmetic number, because the mean of its divisors is an integer number (2027844).

Almost surely, 2^20243505 is an apocalyptic number.

It is an amenable number.

20243505 is a deficient number, since it is larger than the sum of its proper divisors (12201999).

20243505 is a wasteful number, since it uses less digits than its factorization.

20243505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 20243505 is about 4499.2782754571. The cubic root of 20243505 is about 272.5389445784.

Adding to 20243505 its reverse (50534202), we get a palindrome (70777707).

The spelling of 20243505 in words is "twenty million, two hundred forty-three thousand, five hundred five".