20199997157 has 2 divisors, whose sum is σ = 20199997158. Its totient is φ = 20199997156.

The previous prime is 20199997151. The next prime is 20199997163. The reversal of 20199997157 is 75179999102.

It is a balanced prime because it is at equal distance from previous prime (20199997151) and next prime (20199997163).

It can be written as a sum of positive squares in only one way, i.e., 18050191201 + 2149805956 = 134351^2 + 46366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20199997157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20199997096 and 20199997105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20199997151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099998578 + 10099998579.

It is an arithmetic number, because the mean of its divisors is an integer number (10099998579).

Almost surely, 2^20199997157 is an apocalyptic number.

It is an amenable number.

20199997157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20199997157 is an equidigital number, since it uses as much as digits as its factorization.

20199997157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3214890, while the sum is 59.

The spelling of 20199997157 in words is "twenty billion, one hundred ninety-nine million, nine hundred ninety-seven thousand, one hundred fifty-seven".