20797641199 has 4 divisors (see below), whose sum is σ = 21060902560. Its totient is φ = 20534379840.

The previous prime is 20797641191. The next prime is 20797641209. The reversal of 20797641199 is 99114679702.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20797641199 - 2³ = 20797641191 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, 131630562 + ... + 131630719.

It is an arithmetic number, because the mean of its divisors is an integer number (5265225640).

Almost surely, 2^20797641199 is an apocalyptic number.

20797641199 is a deficient number, since it is larger than the sum of its proper divisors (263261361).

20797641199 is an equidigital number, since it uses as much as digits as its factorization.

20797641199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263261360.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The spelling of 20797641199 in words is "twenty billion, seven hundred ninety-seven million, six hundred forty-one thousand, one hundred ninety-nine".