20423142554233 has 4 divisors (see below), whose sum is σ = 20423154403188. Its totient is φ = 20423130705280.

The previous prime is 20423142554219. The next prime is 20423142554279. The reversal of 20423142554233 is 33245524132402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7052067958329 + 13371074595904 = 2655573^2 + 3656648^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423142554233 - 2¹³ = 20423142546041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20423142554203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2784208 + ... + 6971233.

It is an arithmetic number, because the mean of its divisors is an integer number (5105788600797).

Almost surely, 2^{20423142554233} is an apocalyptic number.

It is an amenable number.

20423142554233 is a deficient number, since it is larger than the sum of its proper divisors (11848955).

20423142554233 is an equidigital number, since it uses as much as digits as its factorization.

20423142554233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11848954.

The product of its (nonzero) digits is 691200, while the sum is 40.

Adding to 20423142554233 its reverse (33245524132402), we get a palindrome (53668666686635).

The spelling of 20423142554233 in words is "twenty trillion, four hundred twenty-three billion, one hundred forty-two million, five hundred fifty-four thousand, two hundred thirty-three".