20278979295293 has 2 divisors, whose sum is σ = 20278979295294. Its totient is φ = 20278979295292.

The previous prime is 20278979295247. The next prime is 20278979295301. The reversal of 20278979295293 is 39259297987202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17158591297849 + 3120387997444 = 4142293^2 + 1766462^2 .

It is a cyclic number.

It is not a de Polignac number, because 20278979295293 - 2⁶ = 20278979295229 is a prime.

It is a super-2 number, since 2×20278979295293² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20278979295293.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20278979225293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10139489647646 + 10139489647647.

It is an arithmetic number, because the mean of its divisors is an integer number (10139489647647).

Almost surely, 2^{20278979295293} is an apocalyptic number.

It is an amenable number.

20278979295293 is a deficient number, since it is larger than the sum of its proper divisors (1).

20278979295293 is an equidigital number, since it uses as much as digits as its factorization.

20278979295293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 617258880, while the sum is 74.

The spelling of 20278979295293 in words is "twenty trillion, two hundred seventy-eight billion, nine hundred seventy-nine million, two hundred ninety-five thousand, two hundred ninety-three".