20388742184 has 8 divisors (see below), whose sum is σ = 38228891610. Its totient is φ = 10194371088.

The previous prime is 20388742177. The next prime is 20388742207. The reversal of 20388742184 is 48124788302.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17076739684 + 3312002500 = 130678^2 + 57550^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1274296379 + ... + 1274296394.

Almost surely, 2^20388742184 is an apocalyptic number.

It is an amenable number.

20388742184 is a deficient number, since it is larger than the sum of its proper divisors (17840149426).

20388742184 is a wasteful number, since it uses less digits than its factorization.

20388742184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548592779 (or 2548592775 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 47.

The spelling of 20388742184 in words is "twenty billion, three hundred eighty-eight million, seven hundred forty-two thousand, one hundred eighty-four".