20543018128 has 10 divisors (see below), whose sum is σ = 39802097654. Its totient is φ = 10271509056.

The previous prime is 20543018117. The next prime is 20543018131. The reversal of 20543018128 is 82181034502.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 12649051024 + 7893967104 = 112468^2 + 88848^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20543018093 and 20543018102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641969301 + ... + 641969332.

Almost surely, 2^20543018128 is an apocalyptic number.

It is an amenable number.

20543018128 is a deficient number, since it is larger than the sum of its proper divisors (19259079526).

20543018128 is a wasteful number, since it uses less digits than its factorization.

20543018128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283938641 (or 1283938635 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The spelling of 20543018128 in words is "twenty billion, five hundred forty-three million, eighteen thousand, one hundred twenty-eight".