20248561161 has 12 divisors (see below), whose sum is σ = 30968387892. Its totient is φ = 12704979456.

The previous prime is 20248561111. The next prime is 20248561169. The reversal of 20248561161 is 16116584202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19024960761 + 1223600400 = 137931^2 + 34980^2 .

It is not a de Polignac number, because 20248561161 - 2⁷ = 20248561033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20248561169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66171616 + ... + 66171921.

It is an arithmetic number, because the mean of its divisors is an integer number (2580698991).

Almost surely, 2^20248561161 is an apocalyptic number.

It is an amenable number.

20248561161 is a deficient number, since it is larger than the sum of its proper divisors (10719826731).

20248561161 is a wasteful number, since it uses less digits than its factorization.

20248561161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132343560 (or 132343557 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 20248561161 in words is "twenty billion, two hundred forty-eight million, five hundred sixty-one thousand, one hundred sixty-one".