20533240423 has 4 divisors (see below), whose sum is σ = 20651929848. Its totient is φ = 20414551000.

The previous prime is 20533240421. The next prime is 20533240433. The reversal of 20533240423 is 32404233502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20533240423 - 2¹ = 20533240421 is a prime.

It is a super-2 number, since 2×20533240423² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20533240391 and 20533240400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20533240421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59344453 + ... + 59344798.

It is an arithmetic number, because the mean of its divisors is an integer number (5162982462).

Almost surely, 2^20533240423 is an apocalyptic number.

20533240423 is a deficient number, since it is larger than the sum of its proper divisors (118689425).

20533240423 is a wasteful number, since it uses less digits than its factorization.

20533240423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118689424.

The product of its (nonzero) digits is 17280, while the sum is 28.

Adding to 20533240423 its reverse (32404233502), we get a palindrome (52937473925).

The spelling of 20533240423 in words is "twenty billion, five hundred thirty-three million, two hundred forty thousand, four hundred twenty-three".