20523324431 has 4 divisors (see below), whose sum is σ = 20722580112. Its totient is φ = 20324068752.

The previous prime is 20523324343. The next prime is 20523324433. The reversal of 20523324431 is 13442332502.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20523324431 is a prime.

It is a super-2 number, since 2×20523324431² (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 = 20523324394 and 20523324403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20523324433) 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, 99627686 + ... + 99627891.

It is an arithmetic number, because the mean of its divisors is an integer number (5180645028).

Almost surely, 2^20523324431 is an apocalyptic number.

20523324431 is a deficient number, since it is larger than the sum of its proper divisors (199255681).

20523324431 is a wasteful number, since it uses less digits than its factorization.

20523324431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199255680.

The product of its (nonzero) digits is 17280, while the sum is 29.

Adding to 20523324431 its reverse (13442332502), we get a palindrome (33965656933).

The spelling of 20523324431 in words is "twenty billion, five hundred twenty-three million, three hundred twenty-four thousand, four hundred thirty-one".