20128454500 has 192 divisors, whose sum is σ = 55477094400. Its totient is φ = 6197232000.

The previous prime is 20128454497. The next prime is 20128454527. The reversal of 20128454500 is 545482102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3192351 + ... + 3198649.

It is an arithmetic number, because the mean of its divisors is an integer number (288943200).

Almost surely, 2^20128454500 is an apocalyptic number.

20128454500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20128454500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27738547200).

20128454500 is an abundant number, since it is smaller than the sum of its proper divisors (35348639900).

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

20128454500 is a wasteful number, since it uses less digits than its factorization.

20128454500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6419 (or 6407 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 31.

The spelling of 20128454500 in words is "twenty billion, one hundred twenty-eight million, four hundred fifty-four thousand, five hundred".