20020128104 has 16 divisors (see below), whose sum is σ = 38748635520. Its totient is φ = 9687158640.

The previous prime is 20020128083. The next prime is 20020128109. The reversal of 20020128104 is 40182102002.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20020128109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40362914 + ... + 40363409.

It is an arithmetic number, because the mean of its divisors is an integer number (2421789720).

Almost surely, 2^20020128104 is an apocalyptic number.

It is an amenable number.

20020128104 is a deficient number, since it is larger than the sum of its proper divisors (18728507416).

20020128104 is a wasteful number, since it uses less digits than its factorization.

20020128104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80726360 (or 80726356 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The spelling of 20020128104 in words is "twenty billion, twenty million, one hundred twenty-eight thousand, one hundred four".