20678117 has 2 divisors, whose sum is σ = 20678118. Its totient is φ = 20678116.

The previous prime is 20678101. The next prime is 20678123. The reversal of 20678117 is 71187602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17859076 + 2819041 = 4226^2 + 1679^2 .

It is a cyclic number.

It is not a de Polignac number, because 20678117 - 2⁴ = 20678101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20678197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10339058 + 10339059.

It is an arithmetic number, because the mean of its divisors is an integer number (10339059).

Almost surely, 2^20678117 is an apocalyptic number.

It is an amenable number.

20678117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20678117 is an equidigital number, since it uses as much as digits as its factorization.

20678117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 20678117 is about 4547.3197600345. The cubic root of 20678117 is about 274.4755492193.

The spelling of 20678117 in words is "twenty million, six hundred seventy-eight thousand, one hundred seventeen".