20858107 has 2 divisors, whose sum is σ = 20858108. Its totient is φ = 20858106.

The previous prime is 20858087. The next prime is 20858111. The reversal of 20858107 is 70185802.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20858107 is a prime.

It is not a weakly prime, because it can be changed into another prime (20858147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10429053 + 10429054.

It is an arithmetic number, because the mean of its divisors is an integer number (10429054).

Almost surely, 2^20858107 is an apocalyptic number.

20858107 is a deficient number, since it is larger than the sum of its proper divisors (1).

20858107 is an equidigital number, since it uses as much as digits as its factorization.

20858107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 20858107 is about 4567.0676587938. The cubic root of 20858107 is about 275.2696286643.

The spelling of 20858107 in words is "twenty million, eight hundred fifty-eight thousand, one hundred seven".