20123040877 has 2 divisors, whose sum is σ = 20123040878. Its totient is φ = 20123040876.

The previous prime is 20123040859. The next prime is 20123040893. The reversal of 20123040877 is 77804032102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17856709641 + 2266331236 = 133629^2 + 47606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123040877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123040827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061520438 + 10061520439.

It is an arithmetic number, because the mean of its divisors is an integer number (10061520439).

Almost surely, 2^20123040877 is an apocalyptic number.

It is an amenable number.

20123040877 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123040877 is an equidigital number, since it uses as much as digits as its factorization.

20123040877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 34.

Adding to 20123040877 its reverse (77804032102), we get a palindrome (97927072979).

The spelling of 20123040877 in words is "twenty billion, one hundred twenty-three million, forty thousand, eight hundred seventy-seven".