20868811488 has 240 divisors, whose sum is σ = 71576920800. Its totient is φ = 5962263552.

The previous prime is 20868811487. The next prime is 20868811511. The reversal of 20868811488 is 88411886802.

20868811488 is a `hidden beast` number, since 2 + 0 + 86 + 8 + 81 + 1 + 488 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20868811487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 877320 + ... + 900792.

It is an arithmetic number, because the mean of its divisors is an integer number (298237170).

Almost surely, 2^20868811488 is an apocalyptic number.

20868811488 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 20868811488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35788460400).

20868811488 is an abundant number, since it is smaller than the sum of its proper divisors (50708109312).

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

20868811488 is an equidigital number, since it uses as much as digits as its factorization.

20868811488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23516 (or 23485 counting only the distinct ones).

The product of its (nonzero) digits is 1572864, while the sum is 54.

The spelling of 20868811488 in words is "twenty billion, eight hundred sixty-eight million, eight hundred eleven thousand, four hundred eighty-eight".