20760911808 has 448 divisors, whose sum is σ = 69640704000. Its totient is φ = 5345353728.

The previous prime is 20760911803. The next prime is 20760911851. The reversal of 20760911808 is 80811906702.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 20760911808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20760911803) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 233268628 + ... + 233268716.

It is an arithmetic number, because the mean of its divisors is an integer number (155448000).

Almost surely, 2^20760911808 is an apocalyptic number.

20760911808 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 20760911808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34820352000).

20760911808 is an abundant number, since it is smaller than the sum of its proper divisors (48879792192).

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

20760911808 is an equidigital number, since it uses as much as digits as its factorization.

20760911808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 42.

The spelling of 20760911808 in words is "twenty billion, seven hundred sixty million, nine hundred eleven thousand, eight hundred eight".