20679877 has 2 divisors, whose sum is σ = 20679878. Its totient is φ = 20679876.

The previous prime is 20679853. The next prime is 20679959. The reversal of 20679877 is 77897602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17690436 + 2989441 = 4206^2 + 1729^2 .

It is a cyclic number.

It is not a de Polignac number, because 20679877 - 2¹⁹ = 20155589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20679817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339938 + 10339939.

It is an arithmetic number, because the mean of its divisors is an integer number (10339939).

Almost surely, 2^20679877 is an apocalyptic number.

It is an amenable number.

20679877 is a deficient number, since it is larger than the sum of its proper divisors (1).

20679877 is an equidigital number, since it uses as much as digits as its factorization.

20679877 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 square root of 20679877 is about 4547.5132765062. The cubic root of 20679877 is about 274.4833362479.

The spelling of 20679877 in words is "twenty million, six hundred seventy-nine thousand, eight hundred seventy-seven".