20015807084856 has 256 divisors, whose sum is σ = 62583107328000. Its totient is φ = 5875142492160.

The previous prime is 20015807084803. The next prime is 20015807084863. The reversal of 20015807084856 is 65848070851002.

20015807084856 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 580 + 7 + 0 + 8 + 4 + 8 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9908280 + ... + 11756088.

It is an arithmetic number, because the mean of its divisors is an integer number (244465263000).

Almost surely, 2^{20015807084856} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20015807084856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31291553664000).

20015807084856 is an abundant number, since it is smaller than the sum of its proper divisors (42567300243144).

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

20015807084856 is a wasteful number, since it uses less digits than its factorization.

20015807084856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847979 (or 1847969 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 54.

The spelling of 20015807084856 in words is "twenty trillion, fifteen billion, eight hundred seven million, eighty-four thousand, eight hundred fifty-six".