20128252831506 has 96 divisors (see below), whose sum is σ = 46023875352000. Its totient is φ = 6340049362944.

The previous prime is 20128252831441. The next prime is 20128252831567. The reversal of 20128252831506 is 60513825282102.

20128252831506 is a `hidden beast` number, since 2 + 0 + 1 + 282 + 52 + 8 + 315 + 0 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1632587950 + ... + 1632600278.

It is an arithmetic number, because the mean of its divisors is an integer number (479415368250).

Almost surely, 2^{20128252831506} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20128252831506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23011937676000).

20128252831506 is an abundant number, since it is smaller than the sum of its proper divisors (25895622520494).

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

20128252831506 is a wasteful number, since it uses less digits than its factorization.

20128252831506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24168 (or 24165 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 20128252831506 in words is "twenty trillion, one hundred twenty-eight billion, two hundred fifty-two million, eight hundred thirty-one thousand, five hundred six".