20279780713 has 2 divisors, whose sum is σ = 20279780714. Its totient is φ = 20279780712.

The previous prime is 20279780711. The next prime is 20279780749. The reversal of 20279780713 is 31708797202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12141395344 + 8138385369 = 110188^2 + 90213^2 .

It is a cyclic number.

It is not a de Polignac number, because 20279780713 - 2¹ = 20279780711 is a prime.

It is a super-2 number, since 2×20279780713² (a number of 21 digits) contains 22 as substring.

Together with 20279780711, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20279780711) 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, 10139890356 + 10139890357.

It is an arithmetic number, because the mean of its divisors is an integer number (10139890357).

Almost surely, 2^20279780713 is an apocalyptic number.

It is an amenable number.

20279780713 is a deficient number, since it is larger than the sum of its proper divisors (1).

20279780713 is an equidigital number, since it uses as much as digits as its factorization.

20279780713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 46.

The spelling of 20279780713 in words is "twenty billion, two hundred seventy-nine million, seven hundred eighty thousand, seven hundred thirteen".