20679613 has 2 divisors, whose sum is σ = 20679614. Its totient is φ = 20679612.

The previous prime is 20679587. The next prime is 20679641. The reversal of 20679613 is 31697602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20412324 + 267289 = 4518^2 + 517^2 .

It is a cyclic number.

It is not a de Polignac number, because 20679613 - 2⁹ = 20679101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20679643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339806 + 10339807.

It is an arithmetic number, because the mean of its divisors is an integer number (10339807).

Almost surely, 2^20679613 is an apocalyptic number.

It is an amenable number.

20679613 is a deficient number, since it is larger than the sum of its proper divisors (1).

20679613 is an equidigital number, since it uses as much as digits as its factorization.

20679613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 20679613 is about 4547.4842495604. The cubic root of 20679613 is about 274.4821682218.

The spelling of 20679613 in words is "twenty million, six hundred seventy-nine thousand, six hundred thirteen".