20646107 has 2 divisors, whose sum is σ = 20646108. Its totient is φ = 20646106.

The previous prime is 20646091. The next prime is 20646137. The reversal of 20646107 is 70164602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20646107 - 2⁴ = 20646091 is a prime.

It is not a weakly prime, because it can be changed into another prime (20646137) 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, 10323053 + 10323054.

It is an arithmetic number, because the mean of its divisors is an integer number (10323054).

Almost surely, 2^20646107 is an apocalyptic number.

20646107 is a deficient number, since it is larger than the sum of its proper divisors (1).

20646107 is an equidigital number, since it uses as much as digits as its factorization.

20646107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20646107 is about 4543.7987411416. The cubic root of 20646107 is about 274.3338454748. Note that the first 3 decimals are identical.

The spelling of 20646107 in words is "twenty million, six hundred forty-six thousand, one hundred seven".