20123143493 has 2 divisors, whose sum is σ = 20123143494. Its totient is φ = 20123143492.

The previous prime is 20123143451. The next prime is 20123143499. The reversal of 20123143493 is 39434132102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10795833409 + 9327310084 = 103903^2 + 96578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123143493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123143499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061571746 + 10061571747.

It is an arithmetic number, because the mean of its divisors is an integer number (10061571747).

Almost surely, 2^20123143493 is an apocalyptic number.

It is an amenable number.

20123143493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123143493 is an equidigital number, since it uses as much as digits as its factorization.

20123143493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

Adding to 20123143493 its reverse (39434132102), we get a palindrome (59557275595).

The spelling of 20123143493 in words is "twenty billion, one hundred twenty-three million, one hundred forty-three thousand, four hundred ninety-three".