20231311553 has 4 divisors (see below), whose sum is σ = 20232687060. Its totient is φ = 20229936048.

The previous prime is 20231311537. The next prime is 20231311609. The reversal of 20231311553 is 35511313202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35511313202 = 2 ⋅17755656601.

It can be written as a sum of positive squares in 2 ways, for example, as 6238314289 + 13992997264 = 78983^2 + 118292^2 .

It is a cyclic number.

It is not a de Polignac number, because 20231311553 - 2⁴ = 20231311537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20231311153) 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, 665450 + ... + 695187.

It is an arithmetic number, because the mean of its divisors is an integer number (5058171765).

Almost surely, 2^20231311553 is an apocalyptic number.

It is an amenable number.

20231311553 is a deficient number, since it is larger than the sum of its proper divisors (1375507).

20231311553 is a wasteful number, since it uses less digits than its factorization.

20231311553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1375506.

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 20231311553 its reverse (35511313202), we get a palindrome (55742624755).

The spelling of 20231311553 in words is "twenty billion, two hundred thirty-one million, three hundred eleven thousand, five hundred fifty-three".