20880775680 has 80 divisors (see below), whose sum is σ = 66753254304. Its totient is φ = 5568204800.

The previous prime is 20880775637. The next prime is 20880775697. The reversal of 20880775680 is 8657708802.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1351746 + ... + 1367105.

Almost surely, 2^20880775680 is an apocalyptic number.

20880775680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20880775680 is an abundant number, since it is smaller than the sum of its proper divisors (45872478624).

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

20880775680 is an equidigital number, since it uses as much as digits as its factorization.

20880775680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2718877 (or 2718861 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 51.

The spelling of 20880775680 in words is "twenty billion, eight hundred eighty million, seven hundred seventy-five thousand, six hundred eighty".