20655691197 has 8 divisors (see below), whose sum is σ = 27542324544. Its totient is φ = 13769759328.

The previous prime is 20655691171. The next prime is 20655691241. The reversal of 20655691197 is 79119655602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20655691197 - 2¹¹ = 20655689149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20655691697) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102313 + ... + 227550.

It is an arithmetic number, because the mean of its divisors is an integer number (3442790568).

Almost surely, 2^20655691197 is an apocalyptic number.

It is an amenable number.

20655691197 is a deficient number, since it is larger than the sum of its proper divisors (6886633347).

20655691197 is a wasteful number, since it uses less digits than its factorization.

20655691197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350739.

The product of its (nonzero) digits is 1020600, while the sum is 51.

The spelling of 20655691197 in words is "twenty billion, six hundred fifty-five million, six hundred ninety-one thousand, one hundred ninety-seven".