20018672028 has 18 divisors (see below), whose sum is σ = 50602754384. Its totient is φ = 6672890664.

The previous prime is 20018672027. The next prime is 20018672041. The reversal of 20018672028 is 82027681002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 556074223 = 20018672028 / (2 + 0 + 0 + 1 + 8 + 6 + 7 + 2 + 0 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 20018671983 and 20018672001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018672027) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 278037076 + ... + 278037147.

Almost surely, 2^20018672028 is an apocalyptic number.

It is an amenable number.

20018672028 is an abundant number, since it is smaller than the sum of its proper divisors (30584082356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20018672028 is a wasteful number, since it uses less digits than its factorization.

20018672028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556074233 (or 556074228 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The spelling of 20018672028 in words is "twenty billion, eighteen million, six hundred seventy-two thousand, twenty-eight".