20123430420377 has 2 divisors, whose sum is σ = 20123430420378. Its totient is φ = 20123430420376.

The previous prime is 20123430420329. The next prime is 20123430420439. The reversal of 20123430420377 is 77302403432102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19918181554441 + 205248865936 = 4462979^2 + 453044^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123430420377 - 2²⁴ = 20123413643161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20123430420377.

It is not a weakly prime, because it can be changed into another prime (20123430425377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061715210188 + 10061715210189.

It is an arithmetic number, because the mean of its divisors is an integer number (10061715210189).

Almost surely, 2^{20123430420377} is an apocalyptic number.

It is an amenable number.

20123430420377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123430420377 is an equidigital number, since it uses as much as digits as its factorization.

20123430420377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 38.

Adding to 20123430420377 its reverse (77302403432102), we get a palindrome (97425833852479).

The spelling of 20123430420377 in words is "twenty trillion, one hundred twenty-three billion, four hundred thirty million, four hundred twenty thousand, three hundred seventy-seven".