20202109997 has 2 divisors, whose sum is σ = 20202109998. Its totient is φ = 20202109996.

The previous prime is 20202109981. The next prime is 20202110017. The reversal of 20202109997 is 79990120202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16680755716 + 3521354281 = 129154^2 + 59341^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202109997 - 2⁴ = 20202109981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202109397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101054998 + 10101054999.

It is an arithmetic number, because the mean of its divisors is an integer number (10101054999).

Almost surely, 2^20202109997 is an apocalyptic number.

It is an amenable number.

20202109997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202109997 is an equidigital number, since it uses as much as digits as its factorization.

20202109997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The spelling of 20202109997 in words is "twenty billion, two hundred two million, one hundred nine thousand, nine hundred ninety-seven".