20705107 has 2 divisors, whose sum is σ = 20705108. Its totient is φ = 20705106.

The previous prime is 20705081. The next prime is 20705119. The reversal of 20705107 is 70150702.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20705107 is a prime.

It is not a weakly prime, because it can be changed into another prime (20705137) 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, 10352553 + 10352554.

It is an arithmetic number, because the mean of its divisors is an integer number (10352554).

Almost surely, 2^20705107 is an apocalyptic number.

20705107 is a deficient number, since it is larger than the sum of its proper divisors (1).

20705107 is an equidigital number, since it uses as much as digits as its factorization.

20705107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 20705107 is about 4550.2864744981. The cubic root of 20705107 is about 274.5949165402.

Adding to 20705107 its reverse (70150702), we get a palindrome (90855809).

The spelling of 20705107 in words is "twenty million, seven hundred five thousand, one hundred seven".