20979379297 has 2 divisors, whose sum is σ = 20979379298. Its totient is φ = 20979379296.

The previous prime is 20979379279. The next prime is 20979379357. The reversal of 20979379297 is 79297397902.

Together with previous prime (20979379279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17912877921 + 3066501376 = 133839^2 + 55376^2 .

It is a cyclic number.

It is not a de Polignac number, because 20979379297 - 2¹⁵ = 20979346529 is a prime.

It is not a weakly prime, because it can be changed into another prime (20979379217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10489689648 + 10489689649.

It is an arithmetic number, because the mean of its divisors is an integer number (10489689649).

Almost surely, 2^20979379297 is an apocalyptic number.

It is an amenable number.

20979379297 is a deficient number, since it is larger than the sum of its proper divisors (1).

20979379297 is an equidigital number, since it uses as much as digits as its factorization.

20979379297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27005076, while the sum is 64.

The spelling of 20979379297 in words is "twenty billion, nine hundred seventy-nine million, three hundred seventy-nine thousand, two hundred ninety-seven".