20648487157 has 2 divisors, whose sum is σ = 20648487158. Its totient is φ = 20648487156.

The previous prime is 20648487131. The next prime is 20648487187. The reversal of 20648487157 is 75178484602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11007996561 + 9640490596 = 104919^2 + 98186^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648487157 - 2¹⁵ = 20648454389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20648487127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324243578 + 10324243579.

It is an arithmetic number, because the mean of its divisors is an integer number (10324243579).

Almost surely, 2^20648487157 is an apocalyptic number.

It is an amenable number.

20648487157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648487157 is an equidigital number, since it uses as much as digits as its factorization.

20648487157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3010560, while the sum is 52.

The spelling of 20648487157 in words is "twenty billion, six hundred forty-eight million, four hundred eighty-seven thousand, one hundred fifty-seven".