20881615797 has 96 divisors (see below), whose sum is σ = 38192394240. Its totient is φ = 10712148480.

The previous prime is 20881615789. The next prime is 20881615871. The reversal of 20881615797 is 79751618802.

20881615797 is a `hidden beast` number, since 2 + 0 + 8 + 8 + 1 + 61 + 579 + 7 = 666.

It is not a de Polignac number, because 20881615797 - 2³ = 20881615789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881615397) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 10812922 + ... + 10814852.

It is an arithmetic number, because the mean of its divisors is an integer number (397837440).

Almost surely, 2^20881615797 is an apocalyptic number.

It is an amenable number.

20881615797 is a deficient number, since it is larger than the sum of its proper divisors (17310778443).

20881615797 is a wasteful number, since it uses less digits than its factorization.

20881615797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2423 (or 2420 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 54.

The spelling of 20881615797 in words is "twenty billion, eight hundred eighty-one million, six hundred fifteen thousand, seven hundred ninety-seven".