20745756197 has 16 divisors (see below), whose sum is σ = 21052170240. Its totient is φ = 20442128112.

The previous prime is 20745756191. The next prime is 20745756209. The reversal of 20745756197 is 79165754702.

It is a cyclic number.

It is not a de Polignac number, because 20745756197 - 2¹⁶ = 20745690661 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20745756191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13620878 + ... + 13622400.

It is an arithmetic number, because the mean of its divisors is an integer number (1315760640).

Almost surely, 2^20745756197 is an apocalyptic number.

It is an amenable number.

20745756197 is a deficient number, since it is larger than the sum of its proper divisors (306414043).

20745756197 is a wasteful number, since it uses less digits than its factorization.

20745756197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2312.

The product of its (nonzero) digits is 3704400, while the sum is 53.

The spelling of 20745756197 in words is "twenty billion, seven hundred forty-five million, seven hundred fifty-six thousand, one hundred ninety-seven".