20278668748787 has 2 divisors, whose sum is σ = 20278668748788. Its totient is φ = 20278668748786.

The previous prime is 20278668748771. The next prime is 20278668748801. The reversal of 20278668748787 is 78784786687202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20278668748787 - 2⁴ = 20278668748771 is a prime.

It is a super-2 number, since 2×20278668748787² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20278668748747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10139334374393 + 10139334374394.

It is an arithmetic number, because the mean of its divisors is an integer number (10139334374394).

Almost surely, 2^{20278668748787} is an apocalyptic number.

20278668748787 is a deficient number, since it is larger than the sum of its proper divisors (1).

20278668748787 is an equidigital number, since it uses as much as digits as its factorization.

20278668748787 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5664669696, while the sum is 80.

The spelling of 20278668748787 in words is "twenty trillion, two hundred seventy-eight billion, six hundred sixty-eight million, seven hundred forty-eight thousand, seven hundred eighty-seven".