20299999691 has 2 divisors, whose sum is σ = 20299999692. Its totient is φ = 20299999690.

The previous prime is 20299999649. The next prime is 20299999697. The reversal of 20299999691 is 19699999202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20299999691 - 2¹⁴ = 20299983307 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (20299999697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10149999845 + 10149999846.

It is an arithmetic number, because the mean of its divisors is an integer number (10149999846).

Almost surely, 2^20299999691 is an apocalyptic number.

20299999691 is a deficient number, since it is larger than the sum of its proper divisors (1).

20299999691 is an equidigital number, since it uses as much as digits as its factorization.

20299999691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12754584, while the sum is 65.

The spelling of 20299999691 in words is "twenty billion, two hundred ninety-nine million, nine hundred ninety-nine thousand, six hundred ninety-one".