20028407998500 has 576 divisors, whose sum is σ = 70303823396352. Its totient is φ = 4759171200000.

The previous prime is 20028407998493. The next prime is 20028407998517. The reversal of 20028407998500 is 589970482002.

20028407998500 is a `hidden beast` number, since 2 + 0 + 0 + 2 + 8 + 40 + 7 + 9 + 98 + 500 = 666.

It is a super-2 number, since 2×20028407998500² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 607992030 + ... + 608024970.

It is an arithmetic number, because the mean of its divisors is an integer number (122055248952).

Almost surely, 2^{20028407998500} is an apocalyptic number.

20028407998500 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 20028407998500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35151911698176).

20028407998500 is an abundant number, since it is smaller than the sum of its proper divisors (50275415397852).

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

20028407998500 is a wasteful number, since it uses less digits than its factorization.

20028407998500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33221 (or 33206 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 20028407998500 in words is "twenty trillion, twenty-eight billion, four hundred seven million, nine hundred ninety-eight thousand, five hundred".