20123243377 has 2 divisors, whose sum is σ = 20123243378. Its totient is φ = 20123243376.

The previous prime is 20123243351. The next prime is 20123243411. The reversal of 20123243377 is 77334232102.

It is an a-pointer prime, because the next prime (20123243411) can be obtained adding 20123243377 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16470128896 + 3653114481 = 128336^2 + 60441^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123243377 - 2¹¹ = 20123241329 is a prime.

It is not a weakly prime, because it can be changed into another prime (20123243977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061621688 + 10061621689.

It is an arithmetic number, because the mean of its divisors is an integer number (10061621689).

Almost surely, 2^20123243377 is an apocalyptic number.

It is an amenable number.

20123243377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123243377 is an equidigital number, since it uses as much as digits as its factorization.

20123243377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 34.

Adding to 20123243377 its reverse (77334232102), we get a palindrome (97457475479).

The spelling of 20123243377 in words is "twenty billion, one hundred twenty-three million, two hundred forty-three thousand, three hundred seventy-seven".