20648949193 has 2 divisors, whose sum is σ = 20648949194. Its totient is φ = 20648949192.

The previous prime is 20648949179. The next prime is 20648949221. The reversal of 20648949193 is 39194984602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12323664144 + 8325285049 = 111012^2 + 91243^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648949193 - 2⁵ = 20648949161 is a prime.

It is not a weakly prime, because it can be changed into another prime (20648949493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324474596 + 10324474597.

It is an arithmetic number, because the mean of its divisors is an integer number (10324474597).

Almost surely, 2^20648949193 is an apocalyptic number.

It is an amenable number.

20648949193 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648949193 is an equidigital number, since it uses as much as digits as its factorization.

20648949193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3359232, while the sum is 55.

The spelling of 20648949193 in words is "twenty billion, six hundred forty-eight million, nine hundred forty-nine thousand, one hundred ninety-three".