20686607 has 2 divisors, whose sum is σ = 20686608. Its totient is φ = 20686606.

The previous prime is 20686597. The next prime is 20686613. The reversal of 20686607 is 70668602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20686607 - 2⁶ = 20686543 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20646607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10343303 + 10343304.

It is an arithmetic number, because the mean of its divisors is an integer number (10343304).

Almost surely, 2^20686607 is an apocalyptic number.

20686607 is a deficient number, since it is larger than the sum of its proper divisors (1).

20686607 is an equidigital number, since it uses as much as digits as its factorization.

20686607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 20686607 is about 4548.2531811675. The cubic root of 20686607 is about 274.5131087089.

The spelling of 20686607 in words is "twenty million, six hundred eighty-six thousand, six hundred seven".