20623643077 has 2 divisors, whose sum is σ = 20623643078.
Its totient is φ = 20623643076.
The previous prime is 20623643063. The next prime is 20623643093. The reversal of 20623643077 is 77034632602.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 13873541796 + 6750101281 = 117786^2 + 82159^2
It is a cyclic number.
It is not a de Polignac number, because 20623643077 - 215 = 20623610309 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (20623644077) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311821538 + 10311821539.
It is an arithmetic number, because the mean of its divisors is an integer number (10311821539).
Almost surely, 220623643077 is an apocalyptic number.
It is an amenable number.
20623643077 is a deficient number, since it is larger than the sum of its proper divisors (1).
20623643077 is an equidigital number, since it uses as much as digits as its factorization.
20623643077 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 254016, while the sum is 40.
The spelling of 20623643077 in words is "twenty billion, six hundred twenty-three million, six hundred forty-three thousand, seventy-seven".