20687605848 has 256 divisors, whose sum is σ = 70939008000. Its totient is φ = 5439716352.

The previous prime is 20687605811. The next prime is 20687605907. The reversal of 20687605848 is 84850678602.

20687605848 is a `hidden beast` number, since 20 + 6 + 8 + 7 + 605 + 8 + 4 + 8 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 20687605794 and 20687605803.

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, 7448236 + ... + 7451012.

It is an arithmetic number, because the mean of its divisors is an integer number (277105500).

Almost surely, 2^20687605848 is an apocalyptic number.

20687605848 is a gapful number since it is divisible by the number (28) 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 20687605848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35469504000).

20687605848 is an abundant number, since it is smaller than the sum of its proper divisors (50251402152).

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

20687605848 is a wasteful number, since it uses less digits than its factorization.

20687605848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3191 (or 3181 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 54.

The spelling of 20687605848 in words is "twenty billion, six hundred eighty-seven million, six hundred five thousand, eight hundred forty-eight".