20855587500 has 432 divisors, whose sum is σ = 75752651520. Its totient is φ = 4784400000.

The previous prime is 20855587483. The next prime is 20855587507. The reversal of 20855587500 is 578555802.

20855587500 is a `hidden beast` number, since 20 + 8 + 5 + 558 + 75 + 0 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (20855587507) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 23512057 + ... + 23512943.

It is an arithmetic number, because the mean of its divisors is an integer number (175353360).

Almost surely, 2^20855587500 is an apocalyptic number.

20855587500 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 20855587500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37876325760).

20855587500 is an abundant number, since it is smaller than the sum of its proper divisors (54897064020).

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

20855587500 is a wasteful number, since it uses less digits than its factorization.

20855587500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952 (or 927 counting only the distinct ones).

The product of its (nonzero) digits is 560000, while the sum is 45.

The spelling of 20855587500 in words is "twenty billion, eight hundred fifty-five million, five hundred eighty-seven thousand, five hundred".