20028448208 has 20 divisors (see below), whose sum is σ = 40492298208. Its totient is φ = 9578822880.

The previous prime is 20028448201. The next prime is 20028448211. The reversal of 20028448208 is 80284482002.

It is a happy number.

It is a super-2 number, since 2×20028448208² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20028448201) 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, 27212198 + ... + 27212933.

Almost surely, 2^20028448208 is an apocalyptic number.

It is an amenable number.

20028448208 is an abundant number, since it is smaller than the sum of its proper divisors (20463850000).

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

20028448208 is a wasteful number, since it uses less digits than its factorization.

20028448208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54425162 (or 54425156 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 38.

The spelling of 20028448208 in words is "twenty billion, twenty-eight million, four hundred forty-eight thousand, two hundred eight".