20688403907 has 2 divisors, whose sum is σ = 20688403908. Its totient is φ = 20688403906.

The previous prime is 20688403871. The next prime is 20688403913. The reversal of 20688403907 is 70930488602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20688403907 - 2⁶ = 20688403843 is a prime.

It is not a weakly prime, because it can be changed into another prime (20688403937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10344201953 + 10344201954.

It is an arithmetic number, because the mean of its divisors is an integer number (10344201954).

Almost surely, 2^20688403907 is an apocalyptic number.

20688403907 is a deficient number, since it is larger than the sum of its proper divisors (1).

20688403907 is an equidigital number, since it uses as much as digits as its factorization.

20688403907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 20688403907 in words is "twenty billion, six hundred eighty-eight million, four hundred three thousand, nine hundred seven".