20880916681 has 8 divisors (see below), whose sum is σ = 21339661824. Its totient is φ = 20422774560.

The previous prime is 20880916669. The next prime is 20880916739. The reversal of 20880916681 is 18661908802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20880916681 is a prime.

It is a super-2 number, since 2×20880916681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20880916601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80385 + ... + 219598.

It is an arithmetic number, because the mean of its divisors is an integer number (2667457728).

Almost surely, 2^20880916681 is an apocalyptic number.

It is an amenable number.

20880916681 is a deficient number, since it is larger than the sum of its proper divisors (458745143).

20880916681 is a wasteful number, since it uses less digits than its factorization.

20880916681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301511.

The product of its (nonzero) digits is 331776, while the sum is 49.

The spelling of 20880916681 in words is "twenty billion, eight hundred eighty million, nine hundred sixteen thousand, six hundred eighty-one".