20797641197 has 4 divisors (see below), whose sum is σ = 20832362400. Its totient is φ = 20762919996.

The previous prime is 20797641191. The next prime is 20797641209. The reversal of 20797641197 is 79114679702.

It is a happy number.

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 not a de Polignac number, because 20797641197 - 2¹⁰ = 20797640173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20797641191) 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, 17359703 + ... + 17360900.

It is an arithmetic number, because the mean of its divisors is an integer number (5208090600).

Almost surely, 2^20797641197 is an apocalyptic number.

It is an amenable number.

20797641197 is a deficient number, since it is larger than the sum of its proper divisors (34721203).

20797641197 is an equidigital number, since it uses as much as digits as its factorization.

20797641197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34721202.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The spelling of 20797641197 in words is "twenty billion, seven hundred ninety-seven million, six hundred forty-one thousand, one hundred ninety-seven".