20123774289 has 6 divisors (see below), whose sum is σ = 29067673986. Its totient is φ = 13415849520.

The previous prime is 20123774273. The next prime is 20123774291. The reversal of 20123774289 is 98247732102.

It can be written as a sum of positive squares in only one way, i.e., 19597760064 + 526014225 = 139992^2 + 22935^2 .

It is not a de Polignac number, because 20123774289 - 2⁴ = 20123774273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20123774219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117987452 + ... + 1117987469.

It is an arithmetic number, because the mean of its divisors is an integer number (4844612331).

Almost surely, 2^20123774289 is an apocalyptic number.

It is an amenable number.

20123774289 is a deficient number, since it is larger than the sum of its proper divisors (8943899697).

20123774289 is a wasteful number, since it uses less digits than its factorization.

20123774289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2235974927 (or 2235974924 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 20123774289 in words is "twenty billion, one hundred twenty-three million, seven hundred seventy-four thousand, two hundred eighty-nine".