20861158500 has 384 divisors, whose sum is σ = 83078661120. Its totient is φ = 4401216000.

The previous prime is 20861158459. The next prime is 20861158501. The reversal of 20861158500 is 585116802.

20861158500 is a `hidden beast` number, since 20 + 86 + 1 + 1 + 58 + 500 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (20861158501) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1220010 + ... + 1236990.

It is an arithmetic number, because the mean of its divisors is an integer number (216350680).

Almost surely, 2^20861158500 is an apocalyptic number.

20861158500 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 20861158500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41539330560).

20861158500 is an abundant number, since it is smaller than the sum of its proper divisors (62217502620).

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

20861158500 is a wasteful number, since it uses less digits than its factorization.

20861158500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17029 (or 17011 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 36.

The spelling of 20861158500 in words is "twenty billion, eight hundred sixty-one million, one hundred fifty-eight thousand, five hundred".