20875647157 has 2 divisors, whose sum is σ = 20875647158. Its totient is φ = 20875647156.

The previous prime is 20875647139. The next prime is 20875647167. The reversal of 20875647157 is 75174657802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19961733796 + 913913361 = 141286^2 + 30231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20875647157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20875647167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10437823578 + 10437823579.

It is an arithmetic number, because the mean of its divisors is an integer number (10437823579).

Almost surely, 2^20875647157 is an apocalyptic number.

It is an amenable number.

20875647157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20875647157 is an equidigital number, since it uses as much as digits as its factorization.

20875647157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3292800, while the sum is 52.

The spelling of 20875647157 in words is "twenty billion, eight hundred seventy-five million, six hundred forty-seven thousand, one hundred fifty-seven".