20896941697 has 4 divisors (see below), whose sum is σ = 20925219760. Its totient is φ = 20868663636.

The previous prime is 20896941679. The next prime is 20896941701. The reversal of 20896941697 is 79614969802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20896941697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20896941397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14137923 + ... + 14139400.

It is an arithmetic number, because the mean of its divisors is an integer number (5231304940).

Almost surely, 2^20896941697 is an apocalyptic number.

It is an amenable number.

20896941697 is a deficient number, since it is larger than the sum of its proper divisors (28278063).

20896941697 is an equidigital number, since it uses as much as digits as its factorization.

20896941697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28278062.

The product of its (nonzero) digits is 11757312, while the sum is 61.

The spelling of 20896941697 in words is "twenty billion, eight hundred ninety-six million, nine hundred forty-one thousand, six hundred ninety-seven".